Cisco ONS 15454 SDH Troubleshooting Guide, Release 6.0 - Chapter 1, General Troubleshooting [Cisco ONS 15400 Series]

Table Of Contents

General Troubleshooting

1.1  Troubleshooting Non-DWDM Circuit Paths with Loopbacks

1.1.1  Facility Loopbacks

1.1.2  Terminal Loopbacks

1.1.3  Hairpin Circuits

1.1.4  Cross-Connect Loopbacks

1.2  Troubleshooting Electrical Circuit Paths With Loopbacks

1.2.1  Perform a Facility (Line) Loopback on a Source Electrical Port (West to East)

Create the Facility (Line) Loopback on the Source Electrical Port

Test and Clear the Electrical Port Facility Loopback Circuit

Test the Electrical Cabling

Test the Electrical Card

Test the FMEC

1.2.2  Perform a Hairpin Test on a Source-Node Electrical Port (West to East)

Create the Hairpin Circuit on the Source-Node Electrical Port

Test and Delete the Electrical Port Hairpin Circuit

Test the Standby XC-VXL Cross-Connect Card

Retest the Original XC-VXL Cross-Connect Card

1.2.3  Perform an XC Loopback on a Destination-Node STM-N VC (West to East) Carrying an Electrical Signal

Test and Clear the XC Loopback Circuit

Test the Standby XC-VXC-10G Cross-Connect Card

Retest the Original XC-VXC-10G Cross-Connect Card

1.2.4  Perform a Terminal (Inward) Loopback on a Destination Electrical Port (West to East)

Create the Terminal (Inward) Loopback on a Destination Electrical Port

Test and Clear the Destination Electrical Port Terminal Loopback Circuit

Test the Destination Electrical Card

1.2.5  Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)

Create a Facility (Line) Loopback Circuit on a Destination Electrical Port

Test and Clear the Facility (Line) Loopback Electrical Circuit

Test the Electrical Cabling

Test the Electrical Card

Test the FMEC

1.2.6  Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)

Create the Hairpin Circuit on the Destination-Node Port

Test and Delete the Electrical Hairpin Circuit

Test the Standby XC-VXL Cross-Connect Card

Retest the Original XC-VXL Cross-Connect Card

1.2.7  Perform an XC Loopback on a Source-Node STM-N VC (East to West) Carrying an Electrical Circuit

Create the XC Loopback on the Source Optical Port Carrying an Electrical Circuit

Test and Clear the XC Loopback Circuit

Test the Standby XC-VXL Cross-Connect Card

Retest the Original XC-VXL Cross-Connect Card

1.2.8  Perform a Terminal (Inward) Loopback on a Source-Node Electrical Port (East to West)

Create the Terminal (Inward) Loopback on a Source-Node Electrical Port

Test and Clear the Electrical Port Terminal (Inward) Loopback Circuit

Test the Source Electrical Card

1.3  Troubleshooting Optical Circuit Paths With Loopbacks

1.3.1  Perform a Facility (Line) Loopback on a Source-Node Optical Port

Create the Facility (Line) Loopback on the Source Optical Port

Test and Clear the Facility (Line) Loopback Circuit

Test the Optical Card

1.3.2  Perform a Terminal (Inward) Loopback on a Source-Node Optical Port

Create the Terminal (Inward) Loopback on a Source-Node Optical Port

Test and Clear the Terminal Loopback Circuit

Test the Optical Card

1.3.3  Perform an XC Loopback on the Source Optical Port

Create the XC Loopback on the Source STM-N Port

Test and Clear the XC Loopback Circuit

Test the Standby XC-VXL Cross-Connect Card

Retest the Original XC-VXL Cross-Connect Card

1.3.4  Perform a Facility (Line) Loopback on an Intermediate-Node Optical Port

Create the Facility (Line) Loopback on an Intermediate-Node Optical Port

Test and Clear the Facility (Line) Loopback Circuit

Test the Optical Card

1.3.5  Perform a Terminal (Inward) Loopback on an Intermediate-Node Optical Ports

Create the Terminal Loopback on Intermediate-Node Optical Ports

Test and Clear the Optical Terminal Loopback Circuit

Test the Optical Card

1.3.6  Perform a Facility (Line) Loopback on a Destination-Node Optical Port

Create the Facility (Line) Loopback on a Destination-Node Optical Port

Test the Optical Facility (Line) Loopback Circuit

Test the Optical Card

1.3.7  Perform a Terminal Loopback on a Destination-Node Optical Port

Create the Terminal Loopback on a Destination-Node Optical Port

Test and Clear the Optical Terminal Loopback Circuit

Test the Optical Card

1.4  Troubleshooting Ethernet Circuit Paths With Loopbacks

1.4.1  Perform a Facility (Line) Loopback on a Source-Node Ethernet Port

Create the Facility (Line) Loopback on the Source-Node Ethernet Port

Test and Clear the Facility (Line) Loopback Circuit

Test the Ethernet Card

1.4.2  Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port

Create the Terminal (Inward) Loopback on a Source-Node Ethernet Port

Test and Clear the Ethernet Terminal Loopback Circuit

Test the Ethernet Card

1.4.3  Perform a Facility (Line) Loopback on an Intermediate-Node Ethernet Port

Create a Facility (Line) Loopback on an Intermediate-Node Ethernet Port

Test and Clear the Ethernet Facility (Line) Loopback Circuit

Test the Ethernet Card

1.4.4  Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet Port

Create a Terminal Loopback on an Intermediate-Node Ethernet Port

Test and Clear the Ethernet Terminal Loopback Circuit

Test the Ethernet Card

1.4.5  Perform a Facility (Line) Loopback on a Destination-Node Ethernet Port

Create the Facility (Line) Loopback on a Destination-Node Ethernet Port

Test and Clear the Ethernet Facility (Line) Loopback Circuit

Test the Ethernet Card

1.4.6  Perform a Terminal Loopback on a Destination-Node Ethernet Port

Create the Terminal Loopback on a Destination-Node Ethernet Port

Test and Clear the Ethernet Terminal Loopback Circuit

Test the Ethernet Card

1.5  Troubleshooting MXP, TXP, or FC_MR-4 Circuit Paths With Loopbacks

1.5.1  Perform a Facility (Line) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port

Create the Facility (Line) Loopback on the Source-Node MXP/TXP/FC_MR-4 Port

Test and Clear the MXP/TXP/FC_MR-4 Facility (Line) Loopback Circuit

Test the MXP/TXP/FC_MR-4 Card

1.5.2  Perform a Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port

Create the Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port

Test and Clear the MXP/TXP/FC_MR-4 Port Terminal Loopback Circuit

Test the MXP/TXP/FC_MR-4 Card

1.5.3  Perform a Facility (Line) Loopback on an Intermediate-Node MXP/TXP/FC_MR-4 Port

Create a Facility (Line) Loopback on an Intermediate-Node MXP/TXP/FC_MR-4 Port

Test and Clear the MXP/TXP/FC_MR-4 Port Facility (Line) Loopback Circuit

Test the MXP/TXP/FC_MR-4 Card

1.5.4  Perform a Terminal (Inward) Loopback on Intermediate-Node MXP/TXP/FC_MR-4 Ports

Create a Terminal Loopback on Intermediate-Node MXP/TXP/FC_MR-4 Ports

Test and Clear the MXP/TXP/FC_MR-4 Terminal Loopback Circuit

Test the MXP/TXP/FC_MR-4 Card

1.5.5  Perform a Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR-4 Port

Create the Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR-4 Port

Test and Clear the MXP/TXP/FC_MR-4 Facility (Line) Loopback Circuit

Test the MXP/TXP/FC_MR-4 Card

1.5.6  Perform a Terminal Loopback on a Destination-Node MXP/TXP/FC_MR-4 Port

Create the Terminal Loopback on a Destination-Node MXP/TXP/FC_MR-4 Port

Test and Clear the MXP/TXP/FC_MR-4 Terminal Loopback Circuit

Test the MXP/TXP/FC_MR-4 Card

1.6  Troubleshooting DWDM Circuit Paths With ITU-T G.709 Monitoring

1.6.1  ITU-T G.709 Monitoring in Optical Transport Networks

1.6.2  Optical Channel Layer

1.6.3  Optical Multiplex Section Layer

1.6.4  Optical Transmission Section Layer

1.6.5  Performance Monitoring Counters and Threshold Crossing Alerts

Set Node Default BBE or SES Card Thresholds

Provision Individual Card BBE or SES Thresholds in CTC

Provision Card PM Thresholds Using TL1

Provision Optical TCA Thresholds

1.6.6  Forward Error Correction

Provision Card FEC Thresholds

1.6.7  Sample Trouble Resolutions

1.7  Using CTC Diagnostics

1.7.1  Card LED Lamp Tests

Verify General Card LED Operation

Verify G-Series Ethernet or FC_MR-4-4 Card LED Operation

Verify E-Series and ML-Series Ethernet Card LED Operation

1.7.2  Retrieve Diagnostics File Button

Off-Load the Diagnostics File

1.8  Restoring the Database and Default Settings

1.8.1  Restore the Node Database

1.9  PC Connectivity Troubleshooting

1.9.1  PC System Minimum Requirements

1.9.2  Sun System Minimum Requirements

1.9.3  Supported Platforms, Browsers, and JREs

1.9.4  Unsupported Platforms and Browsers

1.9.5  Unable to Verify the IP Configuration of Your PC

Verify the IP Configuration of Your PC

1.9.6  Browser Login Does Not Launch Java

Reconfigure the PC Operating System Java Plug-in Control Panel

Reconfigure the Browser

1.9.7  Unable to Verify the NIC Connection on Your PC

1.9.8  Verify PC Connection to the ONS 15454 SDH (ping)

Ping the ONS 15454 SDH

1.9.9  The IP Address of the Node is Unknown

Retrieve Unknown Node IP Address

1.10  CTC Operation Troubleshooting

1.10.1  Unable to Launch CTC Help After Removing Netscape

Reset Internet Explorer as the Default Browser for CTC

1.10.2  Unable to Change Node View to Network View

Set the CTC_HEAP and CTC_MAX_PERM_SIZE_HEAP Environment Variables for Windows

Set the CTC_HEAP and CTC_MAX_PERM_SIZE_HEAP Environment Variables for Solaris

1.10.3  Browser Stalls When Downloading CTC JAR Files From TCC2/TCC2P Card

Disable the VirusScan Download Scan

1.10.4  CTC Does Not Launch

Redirect the Netscape Cache to a Valid Directory

1.10.5  Slow CTC Operation or Login Problems

Delete the CTC Cache File Automatically

Delete the CTC Cache File Manually

1.10.6  Node Icon is Gray on CTC Network View

1.10.7  CTC Cannot Launch Due to Applet Security Restrictions

Manually Edit the java.policy File

1.10.8  Java Runtime Environment Incompatible

Launch CTC to Correct the Core Version Build

1.10.9  Different CTC Releases Do Not Recognize Each Other

Launch CTC to Correct the Core Version Build

1.10.10  Username or Password Do Not Match

Verify Correct Username and Password

1.10.11  No IP Connectivity Exists Between Nodes

1.10.12  DCC Connection Lost

1.10.13  "Path in Use Error" When Creating a Circuit

1.10.14  Calculate and Design IP Subnets

1.10.15  Ethernet Connections

Verify Ethernet Connections

1.10.16  VLAN Cannot Connect to Network Device from Untag Port

Change VLAN Port Tagged and Untag Settings

1.11  Circuits and Timing

1.11.1  STM-N Circuit Transitions to Partial State

View the State of Circuit Nodes

1.11.2  DS3i-N-12 Card Does Not Report MS-AIS From External Equipment

1.11.3  STM-1 and DCC Limitations

1.11.4  ONS 15454 SDH Switches Timing Reference

1.11.5  Holdover Synchronization Alarm

1.11.6  Free-Running Synchronization Mode

1.11.7  Daisy-Chained BITS Not Functioning

1.11.8  Blinking STAT LED after Installing a Card

1.11.9  Circuits Remain in PARTIAL Status

1.12  Fiber and Cabling

1.12.1  Bit Errors Appear for a Traffic Card

1.12.2  Faulty Fiber-Optic Connections

Verify Fiber-Optic Connections

Crimp Replacement LAN Cables

Replace Faulty GBIC or SFP Connectors

Remove GBIC or SFP Connectors

Install a GBIC with Clips

Install a GBIC with a Handle

1.12.3  Optical Card Transmit and Receive Levels

1.13  Power Supply Problems

Isolate the Cause of Power Supply Problems

1.13.1  Power Consumption for Node and Cards

General Troubleshooting

This chapter provides procedures for troubleshooting the most common problems encountered when operating a Cisco ONS 15454 SDH. To troubleshoot specific ONS 15454 SDH alarms, see Chapter 2, "Alarm Troubleshooting." If you cannot find what you are looking for, contact Cisco Technical Support.

This chapter includes the following sections on network problems:

•Troubleshooting Non-DWDM Circuit Paths with Loopbacks—Describes loopbacks and hairpin circuits, which you can use to test circuit paths through the network or logically isolate faults

Note For dense wavelength-division multiplexing (DWDM) network acceptance tests, refer to the "Perform Network Acceptance Tests" chapter in the Cisco ONS 15454 DWDM Installation and Operations Guide. For SDH network acceptance tests, refer to the "Turn Up Network" chapter in the Cisco ONS 15454 SDH Procedure Guide.

•Troubleshooting Electrical Circuit Paths With Loopbacks—Explains how to use loopback tests described in "Troubleshooting Non-DWDM Circuit Paths with Loopbacks" to isolate trouble on electrical circuits.

•Troubleshooting Optical Circuit Paths With Loopbacks—Explains how to use loopback tests described in "Troubleshooting Non-DWDM Circuit Paths with Loopbacks" to isolate trouble on STM-N optical circuits.

•Troubleshooting Ethernet Circuit Paths With Loopbacks—Explains how to use loopback tests described in the "Troubleshooting Non-DWDM Circuit Paths with Loopbacks" to isolate trouble on G-Series or CE-Series Ethernet circuits.

•Troubleshooting MXP, TXP, or FC_MR-4 Circuit Paths With Loopbacks—Explains how to use loopbacks tests described in"Troubleshooting Non-DWDM Circuit Paths with Loopbacks" to isolate trouble on muxponder (MXP), transponder (TXP), or Fibre Channel (FC_MR-4) circuits.

•Troubleshooting DWDM Circuit Paths With ITU-T G.709 Monitoring—Explains how to utilize performance monitoring (PM) and threshold crossing alerts (TCA) to locate signal degrades on DWDM circuit paths.

The remaining sections describe symptoms, problems, and solutions that are categorized according to the following topics:

•Using CTC Diagnostics—Provides procedures and guidelines for checking card LED readiness and downloading a diagnostic file for Cisco Technical Support (TAC).

•Restoring the Database and Default Settings—Provides procedures for restoring software data and restoring the node to the default setup.

•PC Connectivity Troubleshooting—Provides troubleshooting procedures for PC and network connectivity to the ONS 15454 SDH.

•CTC Operation Troubleshooting—Provides troubleshooting procedures for Cisco Transport Controller (CTC) login or operation problems.

•Circuits and Timing—Provides troubleshooting procedures for circuit creation and error reporting as well as timing reference errors and alarms.

•Fiber and Cabling—Provides troubleshooting procedures for fiber and cabling connectivity errors.

•Power Supply Problems—Provides troubleshooting procedures for power supply problems.

1.1  Troubleshooting Non-DWDM Circuit Paths with Loopbacks

Use loopbacks and hairpin circuits to test newly created SDH circuits before running live traffic or to logically locate the source of a network failure. All ONS 15454 SDH electrical cards, STM-N cards, G-Series Ethernet cards, MXP, TXP cards, and FC_MR-4 cards allow loopbacks and hairpin test circuits. Other cards that do not allow loopback include E-Series Ethernet, ML-Series Ethernet, and DWDM cards such as Optical Booster (OPT-BST), Optical Preamplifier (OPT-PRE), Optical Service Channel and Combiner/Splitter Module (OSC-CSM), Band Optical Add/Drop Multiplexing (AD-xB-xx.x), and Channel Optical Add/Drop Multiplexing (AD-xC-xx.x) cards.

To create a loopback on a port, the port must be in the Locked,maintenance Admin State and the Locked-Enabled, loopback & maintenance service state.

Caution Facility (line) or terminal loopbacks can be service-affecting. To protect traffic, apply a lockout or Force switch to the target loopback port. Basic directions for these procedures exist in the "2.10.2  Protection Switching, Lock Initiation, and Clearing" section on page 2-230. For detailed information, refer to the "Maintain the Node" chapter in the Cisco ONS 15454 SDH Procedure Guide.

Caution On STM-N cards, a facility (line) loopback applies to the entire card and not an individual circuit. Exercise caution when using loopbacks on an STM-N card carrying live traffic.

1.1.1  Facility Loopbacks

The following sections give general information about facility loopback operations and specific information about ONS 15454 SDH card loopback activity.

1.1.1.1  General Behavior

A facility (line) loopback tests the line interface unit (LIU) of a card, the Front Mount Electrical Connection (FMEC) card, and related cabling. After applying a facility loopback on a port, use a test set to run traffic over the loopback. A successful facility loopback isolates the LIU, the Front-Mount Electrical Card (FMEC), or the cabling plant as the potential cause of a network problem. Figure 1-1 shows a facility loopback on an E1-N-14 card.

Figure 1-1 Facility (Line) Loopback Path on a Near-End E1-N-14 Card

To test an optical card LIU, connect an optical test set to the optical port and perform a facility (line) loopback. Or use a loopback or hairpin on a card that is farther along the circuit path. Figure 1-2 shows a facility loopback on an STM-N card.

Figure 1-2 Facility (Line) Loopback Process on a Near-End STM-N Card

In CTC, STM-N cards with facility loopbacks show an icon (Figure 1-3). Loopback icons are not shown on other cards in this release.

Figure 1-3 STM-N Facility Loopback Indicator

Caution Before performing a facility (line) loopback on an optical card, be sure the card contains at least two data communications channel (DCC) paths to the node where the card is installed. A second DCC provides a nonlooped path to log into the node after the loopback is applied, enabling you to remove the facility loopback. Ensuring a second DCC is not necessary if you are directly connected to the ONS 15454 SDH containing the loopback optical card.

1.1.1.2  ONS 15454 SDH Card Behavior

ONS 15454 SDH port loopbacks either terminate or bridge the loopback signal. All ONS 15454 SDH optical, electrical, Ethernet, MXP, TXP, and FC_MR-4 facility loopbacks are terminated as shown in Table 1-1.

When a port terminates a facility loopback signal, the signal only loops back to the originating port and is not transmitted downstream. When a port bridges a loopback signal, the signal loops back to the originating port and is also transmitted downstream.

Note In Table 1-1, no alarm indication signal (AIS) signal is injected if the signal is bridged. If the signal is terminated, an AIS is injected downstream for all cards except Ethernet cards.

Table 1-1 ONS 15454 SDH Card Facility Loopback Behavior

Card/Port

Facility Loopback Signal

DS3i-N-12

Terminated

E1-N-14

Terminated

G-Series Ethernet

Terminated¹

MXP, MXPP trunk ports

Bridged

MXP, MXPP client ports

Terminated

TXP, TXPP trunk ports

Bridged

TXP, TXPP client ports

Terminated

STM1-E in STM1-E mode

Terminated

STM1-E ports 9-12 in E4 mode²

Terminated

¹G-Series facility loopback is terminated and no AIS is sent downstream. However, the Cisco Link Integrity signal continues to be sent downstream.

²For the STM1-E card, only Ports 9 through 12 can be placed in E4 mode.

The loopback itself is listed in the Conditions window. For example, the window would list the LPBKTERMINAL condition or LPBKFACILITY condition for a tested port. (The Alarms window will show AS-MT, which means that alarms are suppressed on the facility during loopback.)

In addition to the Conditions window listing, the following behaviors occur:

•If an electrical or optical port is in the Locked-enabled,disabled service state, it injects an AIS signal upstream and downstream.

•When an electrical or optical port is placed in the Locked-enabled,maintenance service state before loopback testing, the port clears the AIS signal upstream and downstream unless there is a service-affecting defect that would also cause an AIS signal to be injected.

MXP and TXP card facility loopbacks behave differently from other ONS 15454 SDH cards. With a client-side MXP or TXP facility loopback, the client port is in the Locked-enabled,maintenance & loopback service state, however the remaining client and trunk ports can be in any other service state. For MXP and TXP cards in a trunk-side facility loopback, the trunk port is in the Locked-enabled,maintenance & loopback service state and the remaining client and trunk ports can be in any other service state.

Caution A lock out of protection must be executed before putting a two-fiber or four-fiber BLSR span into a facility loopback state. That is, a span lockout of one side (such as the east side) of a two-fiber BLSR is required before operating a facility loopback on the same (east) side of the ring. A span lockout of one protection side (such as the east protection side) of a four-fiber BLSR is required before operating a facility loopback on the same (east) side working line of the ring. If you do not execute the lockout prior to creating the loopback, the ring can become stuck in an anomalous state after you release the loopback.

1.1.2  Terminal Loopbacks

The following sections give general information about terminal loopback operations and specific information about ONS 15454 SDH card loopback activity.

1.1.2.1  General Behavior

A terminal loopback tests a circuit path as it passes through the XC-VXL cross-connect card loops back from the card with the loopback. Figure 1-4 shows a terminal loopback on an STM-N card. The test-set traffic comes into the electrical card and goes through the cross-connect card to the STM-N card. The terminal loopback on the STM-N card turns the signal around before it reaches the LIU and sends it back through the cross-connect card to the E1-N-14 card. This test verifies that the cross-connect card and terminal circuit paths are valid, but does not test the LIU on the STM-N card.

Figure 1-4 Terminal Loopback Path on an STM-N Card

In CTC, STM-N cards with terminal loopbacks show an icon (Figure 1-5). Loopback icons are not shown on other cards in this release.

Figure 1-5 Terminal Loopback Indicator

Figure 1-6 shows a terminal loopback on an E1-N-14 electrical card. The test-set traffic comes in on the STM-N card and goes through the cross-connect card to the E1-N-14 card. The terminal loopback on the E1-N-14 card turns the signal around before it reaches the LIU and sends it back through the cross-connect card to the STM-N card. This test verifies that the cross-connect card and terminal circuit paths are valid, but does not test the LIU on the E1-N-14 card.

Figure 1-6 Terminal Loopback Process on an E1-N-14 Card

1.1.2.2  ONS 15454 SDH Card Behavior

ONS 15454 SDH port loopbacks can either terminate or bridge the loopback signal. In the ONS 15454 SDH system, all optical, electrical, Ethernet, MXP, TXP, and FC_MR-4 facility loopbacks are terminated as shown in Table 1-2. During terminal loopbacks, some ONS 15454 SDH cards bridge the loopback signal while others terminate it.

If a port terminates a terminal or facility loopback signal, the signal only loops back to the originating port and is not transmitted downstream. If the port bridges a loopback signal, the signal loops back to the originating port and is also transmitted downstream.

ONS 15454 SDH card terminal loopback bridging and terminating behaviors are listed in Table 1-2.

Note In Table 1-2, no AIS signal is injected if the signal is bridged. If the signal is terminated, an applicable AIS is injected downstream for all cards except Ethernet cards.

Table 1-2 ONS 15454 SDH Card Terminal Loopback Behavior

Card/Port

Terminal Loopback Signal

DS3i-N-12

Bridged

E1-N

Terminated

G-Series Ethernet

Terminated¹

MXP, MXPP trunk ports

Bridged

MXP, MXPP client ports

Terminated

TXP, TXPP trunk ports

Bridged

TXP, TXPP client ports

Terminated

STM1-E in STM1-E mode

Terminated

STM1-E ports 9-12 in E4 mode²

Bridged

¹G-Series Ethernet terminal loopback is terminated and Ethernet transmission is disabled. No AIS is inserted for Ethernet, but a TPTFAIL alarm is raised on the far-end Ethernet port.

²For the STM1-E card, only Ports 9 through 12 can be placed in E4 mode.

Bridged E1-N-14 and STM-N terminal loopback examples are shown in Figure 1-7 and Figure 1-8.

Figure 1-7 Terminal Loopback on an E1-N-14 Card with Bridged Signal

Figure 1-8 Terminal Loopback on an STM-N Card with Bridged Signal

G-Series Ethernet cards placed in terminal loopback have different performance monitoring behavior from other ONS 15454 SDH cards. (For more information about performance monitoring counters, see the Chapter 5, "Performance Monitoring.") Setting a terminal loopback on the G-Series card might not stop the Tx Packets counter or the Rx Packet counters on the CTC card-level view Performance > Statistics page from increasing. The counters can increment even though the loopbacked port has temporarily disabled the transmit laser and is dropping any received packets.

The Tx Packet statistic continues to increment because the statistic is not based on the packets transmitted by the transmit laser but on the transmit signal inside the G-Series card. In normal Unlocked-enabled port operation, the transmit signal being recorded does result in the transmit laser transmitting packets, but in a terminal loopback this signal is being looped back within the G-Series card and does not result in the transmit laser transmitting packets.

The Rx Packet counter might also continue to increment when the G-Series card is in terminal loopback. Receive (Rx) packets from any connected device are dropped and not recorded, but the internally looped back packets follow the G-Series card's normal receive path and register on the Rx Packet counter.

MXP and TXP card facility loopbacks have different service state behaviors and requirements from other ONS 15454 SDH cards. The cards can simultaneously maintain different service states. The following behaviors also occur:

•For TXP and TXPP client-side facility loopback, the client port is in the Locked-enabled,maintenance & loopback service state and the trunk port must be in Unlocked-enabled service state.

•For MXP and MXPP cards with a client-side terminal loopback the client port is in the Locked-enabled,maintenance & loopback service state and remaining client and trunk ports can be in any service state.

•In MXP or TXP trunk-side terminal loopbacks, the trunk port is in the Locked-enabled,maintenance & loopback service state and the client ports must be in Unlocked-enabled service state for complete loopback functionality. A facility loopback affects all client ports because it is performed on the aggregate signal.

The loopback itself is listed in the Conditions window. For example, the window would list the LPBKTERMINAL condition or LPBKFACILITY condition for a tested port. (The Alarms window will show AS-MT, which means that alarms are suppressed on the facility during loopback.)

In addition to the Conditions window listing, the following behaviors occur:

•If an electrical or optical port is in the Locked-enabled,disabled service state, it injects an AIS signal upstream and downstream.

•When an electrical or optical port is placed in the Locked-enabled,maintenance service state before loopback testing, the port clears the AIS signal upstream and downstream unless there is a service-affecting defect that would also cause an AIS signal to be injected.

Caution A lock out of protection must be executed before putting a two-fiber or four-fiber BLSR span into a terminal loopback state. That is, a span lockout of one side (such as the east side) of a two-fiber BLSR is required before operating a facility loopback on the same (east) side of the ring. A span lockout of one protection side (such as the east protection side) of a four-fiber BLSR is required before operating a terminal loopback on the same (east) side working line of the ring. If you do not execute the lockout prior to creating the loopback, the ring can become stuck in an anomalous state after you release the loopback.

1.1.3  Hairpin Circuits

A hairpin circuit brings traffic in and out on an electrical port rather than sending the traffic onto the optical card. A hairpin loops back only the specific VC3 or VC4 circuit and does not cause an entire optical port to loop back, thus preventing a drop of all traffic on the optical port. The hairpin allows you to test a specific VC circuit on nodes running live traffic. Figure 1-9 shows the hairpin circuit path on an E1-N-14 card.

Figure 1-9 Hairpin Circuit Path on an E1-N-14 Card

1.1.4  Cross-Connect Loopbacks

A cross-connect (XC) loopback tests an STM-N circuit path as it passes through the cross-connect card and loops back to the port being tested without affecting other traffic on the optical port. Cross-connect loopbacks are less invasive than terminal or facility loopbacks. Facility and terminal loopback testing and circuit verification often involve taking down the whole line; however, a cross-connect loopback allows you to create a loopback on any embedded channel at supported payloads of VC3 granularity and higher. For example, you can loop back a single STM-1, STM-4, STM-16, etc. on an optical facility (line) without interrupting the other synchronous transport signal (STS) circuits.

This test can be conducted locally or remotely through the CTC interface without on-site personnel. It takes place only on an STM-N card and tests the traffic path on that VC (or higher) circuit through the port and cross-connect card. The signal path is similar to a facility loopback.

The XC loopback breaks down the existing path and creates a new cross-connect—a hairpin—while the source of the original path is set to inject a line-side "MS-AIS" condition, page 2-173. The loopback signal path and AIS injection are shown in Figure 1-10.

Figure 1-10 NE with SDH Cross-Connect Loopback Function

When creating cross-connect loopbacks, consult the following rules:

•You can create a cross-connect loopback on all working or protect optical ports unless the protect port is used in a 1+1 protection group and is in working mode.

•If a terminal or facility loopback exists on a port, you cannot use the cross-connect loopback.

1.2  Troubleshooting Electrical Circuit Paths With Loopbacks

Facility (line) loopbacks, terminal (inward) loopbacks, and hairpin circuits are often used to test a circuit path through the network or to logically isolate a fault. Performing a loopback test at each point along the circuit path systematically isolates possible points of failure. These procedures apply to DS-3 and E-1 electrical cards.

The example in this section tests an electrical circuit on a two-node multiplex section-shared protection ring (MS-SPRing). Using a series of facility loopbacks, terminal loopbacks, hairpins, and where appropriate cross-connect loopbacks (on optical paths carrying electrical circuits), the path of the circuit is traced and the possible points of failure are tested and eliminated. A logical progression of five network test procedures applies to this sample scenario:

Note The test sequence for your circuits will differ according to the type of circuit and network topology.

West to east direction (left to right):

1. A facility (line) loopback on the source-node electrical card (DS-3 or E-1)

2. A hairpin on the source-node electrical port

3. An XC loopback on the destination-node STM-N virtual concatenation (VC, carrying the electrical circuit)

4. A terminal (inward) loopback on the destination-node electrical port

East to west direction (right to left):

1. A facility (line) loopback on the destination-node electrical port

2. A hairpin on the destination-node electrical port

3. An XC loopback on the source-node STM-N VC (carrying the electrical circuit)

4. A terminal (inward) loopback on the source-node electrical port

Note Facility, hairpin, and terminal loopback tests require on-site personnel.

1.2.1  Perform a Facility (Line) Loopback on a Source Electrical Port (West to East)

The facility (line) loopback test is performed on the node source port in the network circuit; in this example, the E1-N-14 port is the source. Completing a successful facility (line) loopback on this port isolates the cabling, the electrical card, and the FMEC card as possible failure points. Figure 1-11 shows an example of a facility loopback on a source E1-N-14 port.

Figure 1-11 Facility Loopback on a Circuit Source E1-N-14 Port

Caution Performing a loopback on an Unlocked circuit is service-affecting. To protect traffic, apply a lockout or Force switch to the target loopback port. For detailed information, refer to the "Maintain the Node" chapter in the Cisco ONS 15454 SDH Procedure Guide.

Note Electrical facility (line) loopbacks do not transmit an AIS condition in the direction away from the loopback. Instead of an AIS, a continuance of the signal transmitted to the loopback is provided.

Complete the "Create the Facility (Line) Loopback on the Source Electrical Port" procedure, then test and clear the loopback as instructed.

Create the Facility (Line) Loopback on the Source Electrical Port

Step 1 Connect an electrical test set to the port you are testing. (For instructions to use the test set, consult the manufacturer.)

Step 2 Use appropriate cabling to attach the transmit and receive terminals of the electrical test set to the FMEC connectors or electrical connection panel for the port you are testing. The transmit and receive terminals connect to the same port.

Step 3 Adjust the test set accordingly.

Step 4 In node view, double-click the card to display the card view.

Step 5 Click the Maintenance > Loopback tab.

Step 6 Choose Unlocked,maintenance from the Admin State column for the port being tested.

Step 7 Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport card, select the appropriate row for the port being tested.

Step 8 Click Apply.

Step 9 Click Yes in the confirmation dialog box.

Note It is normal for the "LPBKFACILITY (DS1, DS3)" condition on page 2-152 to appear during loopback setup. The condition clears when you remove the loopback.

Step 10 Complete the "Test and Clear the Electrical Port Facility Loopback Circuit" procedure.

Test and Clear the Electrical Port Facility Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Double-click the card to display the card view.

Step 4 Depending upon the card type, click the Maintenance > Loopback tab.

Step 5 Choose None from the Loopback Type column for the port being tested.

Step 6 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

Step 7 Click Apply.

Step 8 Click Yes in the confirmation dialog box.

Step 9 Complete the "Test the Electrical Cabling" procedure.

Test the Electrical Cabling

Step 1 Replace the suspected bad cabling (the cables from the test set to the electrical connection panel or the FMEC card ports) with a known-good cable.

If a known-good cable is not available, test the suspected bad cable with a test set. Remove the suspected bad cable from the electrical connection panel or the FMEC card and connect the cable to the transmit and receive terminals of the test set. Run traffic to determine whether the cable is good or defective.

Step 2 Replace the defective cable.

Step 3 Click the Maintenance > Loopback tabs.

Note The DS-3 Admin State is the basis of the DS-1 Derived State.

Step 4 Choose None from the Loopback Type column for the port being tested.

Step 5 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

Step 6 Click Apply.

Step 7 Click Yes in the confirmation dialog box.

Step 8 Complete the "Test the Electrical Card" procedure.

Test the Electrical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card installed.

Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco Technical Assistance Center (TAC) numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 In card view for the electrical card, double-click the Maintenance > Loopback tabs.

Note The DS-3 Admin State is the basis of the DS-1 Derived State.

Step 6 Choose None from the Loopback Type column for the port being tested.

Step 7 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

Step 8 Click Apply.

Step 9 Click Yes in the confirmation dialog box.

Step 10 Complete the "Test the FMEC" procedure.

Test the FMEC

Step 1 Remove and reinstall the FMEC card to ensure a proper seating:

a. Unscrew the screws on the FMEC cover and pull the cover forward.

b. Loosen the faceplate screws that hold the FMEC card in place.

c. Pull the FMEC card outward by the faceplate to unseat it from the shelf assembly.

d. Push the FMEC card back inward by the faceplate to reseat it in the shelf assembly.

Step 2 Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the reinstalled FMEC.

Step 3 If the test set indicates a good circuit, the problem is probably an improperly seated FMEC. Click the Maintenance > Loopback tabs.

Step 4 Choose None from the Loopback Type column for the port being tested.

Step 5 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

Step 6 Click Apply.

Step 7 Click Yes in the confirmation dialog box. Continue with Step 17.

Step 8 If the test set indicates a faulty circuit, the problem is probably a defective FMEC card. Return the defective FMEC card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 9 Remove the faulty FMEC and replace it:

a. Unscrew the screws on the FMEC cover and pull the cover forward.

b. Loosen the faceplate screws that hold the FMEC card in place.

c. Pull the FMEC card outward by the faceplate to unseat it from the shelf assembly.

d. Push the FMEC card back inward by the faceplate to reseat it in the shelf assembly.

Step 10 Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the replacement FMEC card.

Step 11 If the test set indicates a faulty circuit, repeat all of the facility loopback procedures.

Step 12 If the test set indicates a good circuit, the problem is probably the defective FMEC card. Click the Maintenance > Loopback tabs.

Step 13 Choose None from the Loopback Type column for the port being tested.

Step 14 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

Step 15 Click Apply.

Step 16 Click Yes in the confirmation dialog box.

Step 17 Complete the "Perform a Hairpin Test on a Source-Node Electrical Port (West to East)" procedure.

1.2.2  Perform a Hairpin Test on a Source-Node Electrical Port (West to East)

The hairpin test is performed on the XC-VXL cross-connect card in the network circuit. A hairpin circuit uses the same port for both source and destination. Completing a successful hairpin through the card isolates the possibility that the cross-connect card is the cause of the faulty circuit. Figure 1-12 shows an example of a hairpin loopback on a source-node port.

Figure 1-12 Hairpin on a Source-Node Port

Note The ONS 15454 SDH does not support simplex operation on the XC-VXL cross-connect card. Two cross-connect cards of the same type must be installed for each node.

Complete the "Create the Hairpin Circuit on the Source-Node Electrical Port" procedure.

Create the Hairpin Circuit on the Source-Node Electrical Port

Step 1 Connect an electrical test set to the port you are testing:

a. If you just completed the "Perform a Facility (Line) Loopback on a Source Electrical Port (West to East)" procedure, leave the electrical test set hooked up to the source-node electrical port.

b. If you are starting the current procedure without the electrical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the electrical test set to the electrical connection panel or the FMEC card connectors for the port you are testing. The transmit and receive terminals connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the hairpin circuit on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type and size, such as VC HO Path Circuit and number of circuits, such as 1.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as Hairpin1.

e. Choose the Size, such as VC4.

f. Uncheck the Bidirectional check box. Leave the default value for State, SD Threshold, and SF Threshold.

g. Click Next.

h. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected. Leave Use Secondary Source unchecked.

i. Click Next.

j. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the Circuit Source dialog box. Leave Use Secondary Destination unchecked.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.

l. If the VC Optimization dialog box is displayed, leave all defaults.

m. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab and that the Dir column describes it as a one-way circuit.

Step 5 Complete the "Test and Delete the Electrical Port Hairpin Circuit" procedure.

Test and Delete the Electrical Port Hairpin Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the hairpin circuit. Clear the hairpin circuit:

a. Click the Circuits tab.

b. Choose the hairpin circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

e. Confirm that the hairpin circuit is deleted form the Circuits tab list.

Step 4 Complete the "Test the Standby XC-VXL Cross-Connect Card" procedure.

Test the Standby XC-VXL Cross-Connect Card

Note Two XC-VXL cross-connect cards (active and standby) must be in use on a node to use this procedure.

Step 1 Perform a reset on the standby cross-connect card to make it the active card:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. Position the cursor over the standby cross-connect card.

c. Right-click and choose RESET CARD.

d. Click Yes in the confirmation dialog box.

Step 2 Initiate an external switching command (side switch) on the cross-connect cards before you retest the loopback circuit:

Caution Cross-connect side switches are service-affecting. Any live traffic on any card in the node endures a hit of up to 50 ms.

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In the node view, select the Maintenance > Cross Connect > Cards tabs.

c. In the Cross Connect Cards menu, click Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 3 Resend test traffic on the loopback circuit.

The test traffic now travels through the alternate cross-connect card.

Step 4 If the test set indicates a faulty circuit, assume the cross-connect card is not causing the problem. Clear the hairpin circuit:

a. Click the Circuits tab.

b. Choose the hairpin circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes. Do not check any check boxes.

e. Confirm that the hairpin circuit is deleted form the Circuits tab list.

Step 5 To confirm a defective original cross-connect card, complete the "Retest the Original XC-VXL Cross-Connect Card" procedure.

Retest the Original XC-VXL Cross-Connect Card

Step 1 Initiate an external switching command (side switch) on the cross-connect cards:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active cross-connect ACT/STBY LED is green.

b. In node view, select the Maintenance > Cross Connect > Cards tabs.

c. From the Cross Connect Cards menu, choose Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 2 Resend test traffic on the loopback circuit.

Step 3 If the test set indicates a faulty circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace an In-Service Cross-Connect Card" procedure on page 2-242 for the defective card.

Step 5 Clear the hairpin circuit:

a. Click the Circuits tab.

b. Choose the hairpin circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

e. Confirm that the hairpin circuit is deleted form the Circuits tab list.

Step 6 Complete the "Perform an XC Loopback on a Destination-Node STM-N VC (West to East) Carrying an Electrical Signal" procedure.

1.2.3  Perform an XC Loopback on a Destination-Node STM-N VC (West to East) Carrying an Electrical Signal

The XC loopback tests whether any problem exists on the circuit's optical span, isolating this span from others present on the card. The loopback occurs on the XC-VXL cross-connect card in a network circuit. Figure 1-13 shows an example of an XC loopback on a destination optical port. The traffic pattern looks similar to a terminal loopback but traffic is only carried on one synchronous transport signal (STS) instead of affecting the entire port.

Note The XC loopback on an optical card does not affect traffic on other circuits.

Note You can perform an XC loopback on either the circuit source working or the protect port of a 1+1 protection group.

Figure 1-13 XC Loopback on a Destination STM-N Port

Step 1 Connect an optical test set to the port you are testing:

Note For specific procedures to connect, set up, and use the test set equipment, consult the manufacturer.

a. If you just completed the "Perform a Hairpin Test on a Source-Node Electrical Port (West to East)" procedure, leave the optical test set hooked up to the destination-node port.

b. If you are starting the current procedure without the optical test set hooked up to the destination port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. The transmit and receive terminals connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to put the circuit being tested out of service:

a. In node view, click the Circuits tab.

b. Click the circuit and then click Edit.

c. In the Edit Circuit dialog box, click the State tab.

d. Choose Locked,maintenance from the Target Circuit State drop-down list.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Use CTC to set up the XC loopback on the circuit being tested:

a. In node view, double-click the optical card to display the card view.

b. Click the Maintenance > Loopback > VC4 tabs.

c. Check the check box in the XC Loopback column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 5 Complete the "Test and Clear the XC Loopback Circuit" procedure.

Test and Clear the XC Loopback Circuit

Note This procedure is performed only on STM-N cards.

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the cross-connect. Clear the XC loopback:

a. In card view, click the Maintenance > Loopback > VC4 tabs.

b. Uncheck the check box in the XC Loopback column for the circuit being tested.

c. Click Apply.

d. Click Yes in the confirmation dialog box.

Step 4 Complete the "Test the Standby XC-VXC-10G Cross-Connect Card" procedure.

Test the Standby XC-VXC-10G Cross-Connect Card

Step 1 Perform a reset on the standby cross-connect card:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. Position the cursor over the standby cross-connect card.

c. Right-click and choose RESET CARD.

d. Click Yes in the confirmation dialog box.

Step 2 Initiate an external switching command (side switch) on the cross-connect cards before you retest the loopback circuit:

Caution Cross-connect side switches are service-affecting. Any live traffic on any card in the node endures a hit of up to 50 ms.

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In the node view, select the Maintenance > Cross-Connect > Card tabs.

c. In the Cross-Connect Cards area, click Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 3 Resend test traffic on the loopback circuit.

The test traffic now travels through the alternate cross-connect card.

Step 4 If the test set indicates a faulty circuit, assume the cross-connect card is not causing the problem. Clear the XC loopback circuit:

a. Click the Circuits tab.

b. Choose the XC loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

e. Confirm that the XC loopback circuit is deleted form the Circuits tab list. If the test set indicates a good circuit, the problem might be a defective cross-connect card.

Step 5 To confirm a defective original cross-connect card, complete the "Retest the Original XC-VXC-10G Cross-Connect Card" procedure.

Retest the Original XC-VXC-10G Cross-Connect Card

Note This procedure is performed only on STM-N and XC-VXL cards.

Step 1 Initiate an external switching command (side switch) on the cross-connect cards:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In node view, select the Maintenance > Cross-Connect > Card tabs.

c. In the Cross-Connect Cards area, click Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 2 Resend test traffic on the loopback circuit.

Step 3 If the test set indicates a faulty circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Proceed to Step 5. If the circuit is not shown to be faulty and the card is not shown to be defective, you are finished with testing.

Step 5 Complete the "Physically Replace an In-Service Cross-Connect Card" procedure on page 2-242 for the defective cross-connect card and perform Step 6.

Step 6 If the test set indicates a good circuit, the cross-connect card might have had a temporary problem that was cleared by the side switch. Clear the XC loopback circuit:

a. Click the Circuits tab.

b. Choose the XC loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 If the tests indicate further problems, go to the "Perform a Terminal (Inward) Loopback on a Destination Electrical Port (West to East)" procedure.

1.2.4  Perform a Terminal (Inward) Loopback on a Destination Electrical Port (West to East)

The terminal (inward) loopback test is performed on the node destination port in the circuit, such as a destination-node electrical port. You first create a bidirectional circuit that starts on the source-node port and loops back on the destination-node electrical port. Then you proceed with the terminal loopback test. Completing a successful terminal loopback to a destination-node electrical port verifies that the circuit is good up to the destination port. Figure 1-14 shows an example of a terminal loopback on a destination E3-12 port.

Figure 1-14 Terminal (Inward) Loopback on a Destination E3-12 Port

Caution Performing a loopback on an Unlocked circuit is service-affecting. To protect traffic, apply a lockout or Force switch to the target loopback port. For detailed information, refer to the "Maintain the Node" chapter in the Cisco ONS 15454 SDH Procedure Guide.

Note Electrical circuit terminal loopbacks do not transmit an AIS condition in the direction away from the loopback. Instead of an AIS, a continuance of the signal transmitted to the loopback is provided.

Complete the "Create the Terminal (Inward) Loopback on a Destination Electrical Port" procedure, then test and clear the loopback as instructed.

Create the Terminal (Inward) Loopback on a Destination Electrical Port

Step 1 Connect an electrical test set to the port you are testing:

a. If you just completed the "Perform an XC Loopback on a Destination-Node STM-N VC (West to East) Carrying an Electrical Signal" procedure, leave the electrical test set hooked up to the source-node port.

b. If you are starting the current procedure without the electrical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the electrical test set to the electrical connection panel or the FMEC card connectors for the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 In CTC node view, click the Circuits tab and click Create.

Step 4 In the Circuit Creation dialog box, choose the type and size, such as such as VC HO Path Circuit, and number, such as 1.

Step 5 Click Next.

Step 6 In the next Circuit Creation dialog box, give the circuit an easily identifiable name, such as ENtoEN.

Step 7 Leave the Bidirectional check box checked. Leave the default value for State.

Step 8 Click Next.

Step 9 In the Circuit Creation source dialog box, select the Node, Slot, Port, and VC4 where the test set is connected.

Step 10 Click Next.

Step 11 In the Circuit Creation destination dialog box, fill in the same Node, Slot, Port, and VC4 (the destination-node port) and click Finish.

Step 12 Confirm that the newly created circuit appears in the Circuits tab Dir column as a two-way circuit.

Note It is normal for a "LPBKTERMINAL (DS1, DS3)" condition, page 2-156 to appear during a loopback setup. The condition clears when you remove the loopback.

Note Electrical circuit terminal loopbacks do not transmit an AIS (see the "AIS" condition on page 2-31) in the direction away from the loopback. Instead of an AIS, a continuance of the signal transmitted to the loopback is provided.

Step 13 Create the terminal (inward) loopback on the destination port being tested:

a. Go to the node view of the destination node:

•Choose View > Go To Other Node from the menu bar.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the card that requires the loopback, such as an E-1 card in the destination node.

c. Click the Maintenance > Loopback tabs.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 14 Complete the "Test and Clear the Destination Electrical Port Terminal Loopback Circuit" procedure.

Test and Clear the Destination Electrical Port Terminal Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Double-click the electrical card in the destination node with the terminal loopback.

Step 4 Click the Maintenance > Loopback tabs.

Step 5 Select None from the Loopback Type column for the port being tested.

Step 6 Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

Step 7 Click Apply.

Step 8 Click Yes in the confirmation dialog box.

Step 9 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 10 Complete the "Test the Destination Electrical Card" procedure.

Test the Destination Electrical Card

Step 1 Replace the suspected bad card with a known-good card. Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card.

Step 3 If the test set indicates a good circuit, the problem is probably the defective card.

a. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

b. Complete "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 4 Clear the terminal (inward) loopback state on the port:

a. Double-click the destination-node electrical card.

b. Click the Maintenance > Loopback tabs.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 5 Clear the terminal (inward) loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 6 Complete the "Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)" procedure.

1.2.5  Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)

The facility loopback test is performed on the destination-node electrical port in the network circuit. Completing a successful facility loopback on this port isolates the possibility that the destination-node cabling, electrical card, LIU, or FMEC card is responsible for a faulty circuit. Figure 1-15 shows an example of a facility loopback on a destination E1-N-14 port.

Figure 1-15 Facility Loopback on a Destination E1-N-14 Port

Note Electrical circuit facility (line) loopbacks do not transmit an AIS condition in the direction away from the loopback. Instead of an AIS, a continuance of the signal transmitted to the loopback is provided.

Caution Performing a loopback on an Unlocked circuit is service-affecting. To protect traffic, apply a lockout or Force switch to the target loopback port. For basic instructions, see the "2.10.2  Protection Switching, Lock Initiation, and Clearing" section on page 2-230. For detailed information, refer to the "Maintain the Node" chapter in the Cisco ONS 15454 SDH Procedure Guide.

Complete the "Create a Facility (Line) Loopback Circuit on a Destination Electrical Port" procedure. Then test and clear the loopback as instructed.

Create a Facility (Line) Loopback Circuit on a Destination Electrical Port

Step 1 Connect an electrical test set to the port you are testing.

a. If you just completed the "Perform a Terminal (Inward) Loopback on a Destination Electrical Port (West to East)" procedure, leave the electrical test set hooked up to the destination-node port.

b. If you are starting the current procedure without the electrical test set hooked up to the destination port, use appropriate cabling to attach the transmit and receive terminals of the electrical test set to the electrical connection panel or the FMEC connectors for the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 In node view, double-click the destination electrical card to display the card view.

Step 4 Click the Maintenance > Loopback tabs.

Step 5 Choose Locked,maintenance from the Admin State column.

Step 6 Select Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport card, select the row appropriate for the desired port.

Step 7 Click Apply.

Step 8 Click Yes in the confirmation dialog box.

Note It is normal for a "LPBKFACILITY (DS1, DS3)" condition, page 2-152 or "LPBKFACILITY (E1, E3, E4)" condition, page 2-153 to appear during loopback setup. The condition clears when you remove the loopback.

Step 9 Complete the "Test and Clear the Facility (Line) Loopback Electrical Circuit" procedure.

Test and Clear the Facility (Line) Loopback Electrical Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the loopback circuit. Double-click the card to display the card view.

Step 4 Click the Maintenance > Loopback tabs.

Step 5 Choose None from the Loopback Type column for the port being tested.

Step 6 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

Step 7 Click Apply.

Step 8 Click Yes in the confirmation dialog box.

Step 9 If the test set indicates a faulty circuit, the problem might be a faulty electrical card, faulty cabling from the electrical card to the connection panel or the FMECs. Complete the "Test the Electrical Cabling" procedure.

Test the Electrical Cabling

Step 1 Replace the suspect cabling (the cables from the test set to the electrical connection panel or the FMEC card ports) with a known-good cable.

If a known-good cable is not available, test the suspected bad cable with a test set. Remove the suspected bad cable from the electrical connection panel or the FMEC card and connect the cable to the transmit and receive terminals of the test set. Run traffic to determine whether the cable is good or defective.

Step 2 Resend test traffic on the loopback circuit with a known-good cable installed.

Step 3 If the test set indicates a good circuit, the problem was probably the defective cable. Replace the defective cable.

Step 4 Double-click the card to display the card view.

Step 5 Click the Maintenance > Loopback tabs.

Step 6 Choose None from the Loopback Type column for the port being tested.

Step 7 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

Step 8 Click Apply.

Step 9 Click Yes in the confirmation dialog box.

Step 10 Complete the "Test the Electrical Card" procedure.

Test the Electrical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card installed.

Step 3 If the test set indicates a good circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Replace the faulty card. Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 Double-click the card to display the card view.

Step 6 Click the Maintenance > Loopback tabs.

Step 7 Choose None from the Loopback Type column for the port being tested.

Step 8 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

Step 9 Click Apply.

Step 10 Click Yes in the confirmation dialog box.

Step 11 Complete the "Test the FMEC" procedure.

Test the FMEC

Step 1 Remove and reinstall the FMEC card to ensure a proper seating:

a. Unscrew the screws on the FMEC cover and pull the cover forward.

b. Loosen the faceplate screws that hold the FMEC card in place.

c. Pull the FMEC card outward by the faceplate to unseat it from the shelf assembly.

d. Push the FMEC card back inward by the faceplate to reseat it in the shelf assembly.

Step 2 Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the reinstalled FMEC card. If the test set indicates a good circuit, the problem is probably an improperly seated FMEC card.

Step 3 Clear the facility (line) loopback:

a. Click the Maintenance > Loopback tabs.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

The entire electrical circuit path has now passed its comprehensive series of loopback tests. This circuit qualifies to carry live traffic.

Step 4 If the test set indicates a faulty circuit, the problem is probably the defective FMEC card. Return the defective FMEC card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 5 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty FMEC card.

Step 6 Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the replacement FMEC card.

Step 7 If the test set indicates a faulty circuit, repeat all of the facility loopback procedures. If the faulty circuit persists, contact the Cisco Technical Support. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 8 If the test set indicates a good circuit, the problem is probably a defective FMEC card. Clear the facility (line) loopback:

a. Click the Maintenance > Loopback tabs.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 9 Complete the "Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)" procedure.

1.2.6  Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)

The hairpin test is performed on the cross-connect card in the network circuit. A hairpin circuit uses the same port for both source and destination. Completing a successful hairpin through the card isolates the possibility that the cross-connect card is the cause of the faulty circuit. Figure 1-16 shows an example of a hairpin loopback on a destination-node port.

Figure 1-16 Hairpin on a Destination-Node Port

Note The ONS 15454 SDH does not support simplex operation on the XC-VXL cross-connect card. Two cross-connect cards of the same type must be installed for each node.

Complete the "Create the Hairpin Circuit on the Destination-Node Port" procedure.

Create the Hairpin Circuit on the Destination-Node Port

Step 1 Connect an electrical test set to the port you are testing:

a. If you just completed the "Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)" procedure, leave the electrical test set hooked up to the electrical port in the destination node.

b. If you are starting the current procedure without the electrical test set hooked up to the electrical port, use appropriate cabling to attach the transmit and receive terminals of the electrical test set to the electrical connection panel or the FMEC connectors for the port you are testing. The transmit and receive terminals connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the hairpin circuit on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type and size, such as VC HO Path Circuit, and number, such as 1.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as Hairpin1.

e. Uncheck the Bidirectional check box. Leave the default value for State, SD Threshold, and SF Threshold.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected. Leave Use Secondary Source unchecked.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box. Leave Use Secondary Destination unchecked.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.

l. If the VC Optimization dialog box appears, leave all defaults.

m. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab and that the Dir column describes it as a one-way circuit.

Step 5 Complete the "Test and Delete the Electrical Hairpin Circuit" procedure.

Test and Delete the Electrical Hairpin Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the hairpin circuit. Clear the hairpin circuit:

a. Click the Circuits tab.

b. Choose the hairpin circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits box.

e. Confirm that the hairpin circuit is deleted form the Circuits tab list.

Step 4 Complete the "Test the Standby XC-VXL Cross-Connect Card" procedure.

Test the Standby XC-VXL Cross-Connect Card

Note Two XC-VXL cross-connect cards (active and standby) must be in use on a node to use this procedure.

Step 1 Perform a reset on the standby XC-VXL cross-connect card to make it the active card:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. Position the cursor over the standby cross-connect card.

c. Right-click and choose RESET CARD.

d. Click Yes in the confirmation dialog box.

Step 2 Initiate an external switching command (side switch) on the cross-connect cards before you retest the loopback circuit:

Caution Cross-connect side switches are service-affecting. Any live traffic on any card in the node endures a hit of up to 50 ms.

a. Determine the standby XC-VXL cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In the node view, select the Maintenance > Cross-Connect > Card tabs.

c. In the Cross-Connect Cards area, click Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active XC-VXL cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 3 Resend test traffic on the loopback circuit.

The test traffic now travels through the alternate cross-connect card.

Step 4 If the test set indicates a faulty circuit, assume the cross-connect card is not causing the problem. Clear the hairpin circuit:

a. Click the Circuits tab.

b. Choose the hairpin circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

e. Confirm that the hairpin circuit is deleted form the Circuits tab list.

Step 5 To confirm a defective original cross-connect card, complete the "Retest the Original XC-VXL Cross-Connect Card" procedure.

Retest the Original XC-VXL Cross-Connect Card

Step 1 Initiate an external switching command (side switch) on the XC-VXL cross-connect cards:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In node view, select the Maintenance > Cross-Connect > Card tabs.

c. From the Cross-Connect Cards menu, choose Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 2 Resend test traffic on the loopback circuit.

Step 3 If the test set indicates a faulty circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Proceed to Step 5. If the test does not indicate a faulty circuit, proceed to Step 6.

Step 5 Complete the "Physically Replace an In-Service Cross-Connect Card" procedure on page 2-242 for the defective cross-connect card.

Step 6 If the test set indicates a good circuit, the cross-connect card might have had a temporary problem that was cleared by the side switch. Clear the hairpin circuit:

a. Click the Circuits tab.

b. Choose the hairpin circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

e. Confirm that the hairpin circuit is deleted form the Circuits tab list.

Step 7 Complete the "Perform an XC Loopback on a Source-Node STM-N VC (East to West) Carrying an Electrical Circuit" procedure.

1.2.7  Perform an XC Loopback on a Source-Node STM-N VC (East to West) Carrying an Electrical Circuit

The XC loopback tests whether any problem exists on the circuit's optical span, isolating this span from others present on the card. It also eliminates the cross-connect card as the source of trouble for a faulty circuit. The loopback occurs on the XC-VXL cross-connect card in a network circuit. Figure 1-17 shows an example of an XC loopback on a source STM-N port.

Note The XC loopback on an STM-N card does not affect traffic on other circuits.

Note You can perform an XC loopback on either the circuit source working or the protect port of a 1+1 protection group.

Figure 1-17 XC Loopback on a Source STM-N Port

Complete the "Create the XC Loopback on the Source Optical Port Carrying an Electrical Circuit" procedure.

Create the XC Loopback on the Source Optical Port Carrying an Electrical Circuit

Step 1 Connect an optical test set to the port you are testing:

Note For specific procedures to connect, set up, and use the test set equipment, consult the manufacturer.

a. If you just completed the "Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. The transmit and receive terminals connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to put the circuit being tested out of service:

a. In node view, click the Circuits tab.

b. Click the circuit and then click Edit.

c. In the Edit Circuit dialog box, click the State tab.

d. Choose Locked,maintenance from the Target Circuit State drop-down list.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Use CTC to set up the XC loopback on the circuit being tested:

a. In node view, double-click the optical card to display the card view.

b. Click the Maintenance > Loopback > VC4 tabs.

c. Click the XC Loopback column check box for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 5 Complete the "Test and Clear the XC Loopback Circuit" procedure.

Test and Clear the XC Loopback Circuit

Note This procedure is performed only on STM-N cards.

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the cross-connect. Clear the XC loopback:

a. In card view, click the Maintenance > Loopback > VC4 tabs.

b. Uncheck the check box in the XC Loopback column for the circuit being tested.

c. Click Apply.

d. Click Yes in the confirmation dialog box.

Step 4 Complete the "Test the Standby XC-VXL Cross-Connect Card" procedure.

Test the Standby XC-VXL Cross-Connect Card

Step 1 Perform a reset on the standby cross-connect card:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. Position the cursor over the standby cross-connect card.

c. Right-click and choose RESET CARD.

d. Click Yes in the confirmation dialog box.

Step 2 Initiate an external switching command (side switch) on the cross-connect cards before you retest the loopback circuit:

Caution Cross-connect side switches are service-affecting. Any live traffic on any card in the node endures a hit of up to 50 ms.

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In the node view, select the Maintenance > Cross-Connect > Card tabs.

c. In the Cross-Connect Cards area, click Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 3 Resend test traffic on the loopback circuit.

The test traffic now travels through the alternate cross-connect card.

Step 4 If the test set indicates a faulty circuit, assume the cross-connect card is not causing the problem. Clear the XC loopback circuit:

a. Click the Circuits tab.

b. Choose the XC loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

e. Confirm that the XC loopback circuit is deleted form the Circuits tab list. If the test set indicates a good circuit, the problem might be a defective cross-connect card.

Step 5 To confirm a defective original cross-connect card, complete the "Retest the Original XC-VXL Cross-Connect Card" procedure.

Retest the Original XC-VXL Cross-Connect Card

Note This procedure is performed only on STM-N and XC-VXL cards.

Step 1 Initiate an external switching command (side switch) on the cross-connect cards:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In node view, select the Maintenance > Cross-Connect > Card tabs.

c. In the Cross-Connect Cards area, click Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 2 Resend test traffic on the loopback circuit.

Step 3 If the test set indicates a faulty circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 If the circuit is not shown to be faulty and the card is not shown to be defective, you are finished with testing.

Step 5 Complete the "Physically Replace an In-Service Cross-Connect Card" procedure on page 2-242 for the defective cross-connect card and perform Step 6.

Step 6 If the test set indicates a good circuit, the cross-connect card might have had a temporary problem that was cleared by the side switch. Clear the XC loopback circuit:

a. Click the Circuits tab.

b. Choose the XC loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 If the problem is not resolved, go to the "Perform a Terminal (Inward) Loopback on a Source-Node Electrical Port (East to West)" procedure.

1.2.8  Perform a Terminal (Inward) Loopback on a Source-Node Electrical Port (East to West)

The terminal (inward) loopback test is performed on the node source port in the circuit, such as a source-node electrical port. You first create a bidirectional circuit that starts on the destination-node electrical port and loops back on the source-node electrical port. Then you proceed with the terminal loopback test. Completing a successful terminal loopback to a source-node port verifies that the circuit is good to the source electrical port. Figure 1-14 shows an example of a terminal loopback on a source electrical port.

Figure 1-18 Terminal (Inward) Loopback on a Source Electrical Port

Caution Performing a loopback on an Unlocked circuit is service-affecting. To protect traffic, apply a lockout or Force switch to the target loopback port. See the "2.10.2  Protection Switching, Lock Initiation, and Clearing" section on page 2-230 for basic instructions. For detailed information, refer to the "Maintain the Node" chapter in the Cisco ONS 15454 SDH Procedure Guide.

Note Electrical circuit terminal loopbacks do not transmit an AIS condition in the direction away from the loopback. Instead of an AIS, a continuance of the signal transmitted to the loopback is provided.

Complete the "Create the Terminal (Inward) Loopback on a Source-Node Electrical Port" procedure.

Create the Terminal (Inward) Loopback on a Source-Node Electrical Port

Step 1 Connect an electrical test set to the port you are testing:

a. If you just completed the "Perform an XC Loopback on a Source-Node STM-N VC (East to West) Carrying an Electrical Circuit" procedure, leave the electrical test set hooked up to the electrical port in the source node.

b. If you are starting the current procedure without the electrical test set hooked up to the electrical port, use appropriate cabling to attach the transmit and receive terminals of the electrical test set to the electrical panel or the FMEC connectors for the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 In CTC node view, click the Circuits tab and click Create.

Step 4 In the Circuit Creation dialog box, choose the type and size, such as VC HO Path Circuit, and the number, such as 1.

Step 5 Click Next.

Step 6 In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as ENtoEN.

Step 7 Leave the Bidirectional check box checked.

Step 8 Click Next.

Step 9 In the Circuit Creation source dialog box, select the Node, Slot, Port, and VC4 where the test set is connected.

Step 10 Click Next.

Step 11 In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

Step 12 Click Next and complete the following substeps:

a. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.

b. In the VC Optimization dialog box, leave all defaults.

c. Click Finish.

Step 13 Confirm that the newly created circuit appears in the Dir column as a two-way circuit.

Note It is normal for a "LPBKTERMINAL (DS1, DS3)" condition on page 2-156 to appear during a loopback setup. The condition clears when you remove the loopback.

Note Electrical circuit terminal loopbacks do not transmit an AIS (see the "AIS" condition on page 2-31) in the direction away from the loopback. Instead of a, electrical line AIS, a continuance of the signal transmitted to the loopback is provided.

Step 14 Create the terminal (inward) loopback on the destination port being tested:

a. Go to the node view of the destination node:

•From the View menu choose Go To Other Node.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the card that requires the loopback, such as the electrical card in the destination node.

c. Click the Maintenance > Loopback tabs.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 15 Complete the "Test and Clear the Electrical Port Terminal (Inward) Loopback Circuit" procedure.

Test and Clear the Electrical Port Terminal (Inward) Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Double-click the electrical card in the destination node with the terminal loopback.

Step 4 Click the Maintenance > Loopback tabs.

Step 5 Select None from the Loopback Type column for the port being tested.

Step 6 Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

Step 7 Click Apply.

Step 8 Click Yes in the confirmation dialog box.

Step 9 Clear the terminal loopback:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 10 Complete the "Test the Source Electrical Card" procedure.

Test the Source Electrical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card.

Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the defective electrical card.

Step 5 Clear the terminal (inward) loopback state on the port:

a. Double-click the electrical card in the destination node with the terminal loopback.

b. Click the Maintenance > Loopback tabs.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Delete the terminal (inward) loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

The circuit qualifies to carry traffic.

1.3  Troubleshooting Optical Circuit Paths With Loopbacks

Facility (line) loopbacks, terminal (inward) loopbacks, and cross-connect loopback circuits are often used together to test the circuit path through the network or to logically isolate a fault. Performing a loopback test at each point along the circuit path systematically isolates possible points of failure.

The procedures in this section apply to optical cards. (For instructions on G-Series Ethernet cards, go to the "Troubleshooting Ethernet Circuit Paths With Loopbacks" section. For information about troubleshooting MXP and TXP cards, go to the "Troubleshooting MXP, TXP, or FC_MR-4 Circuit Paths With Loopbacks" section.) The example in this section tests an optical circuit on a three-node MS-SPRing. Using a series of facility, cross-connect, and terminal (inward) loopbacks, the example scenario traces the circuit path, tests the possible failure points, and eliminates them. The logical progression contains seven network test procedures:

Note The test sequence for your circuits will differ according to the type of circuit and network topology.

1. A facility (line) loopback on the source-node STM-N port

2. A terminal (inward) loopback on the source-node STM-N port

3. A cross-connect loopback on the source STM-N port

4. A facility (line) loopback on the intermediate-node STM-N port

5. A terminal (inward) loopback on the intermediate-node STM-N port

6. A facility (line) loopback on the destination-node STM-N port

7. A terminal (inward) loopback on the destination-node STM-N port

Note Facility, hairpin, and terminal loopback tests require on-site personnel.

1.3.1  Perform a Facility (Line) Loopback on a Source-Node Optical Port

The facility (line) loopback test is performed on the node source port in the network circuit. In the testing situation used in this example, the source STM-N port in the source node. Completing a successful facility (line) loopback on this port isolates the optical port as a possible failure point. Figure 1-19 shows an example of a facility loopback on a circuit source STM-N port.

Figure 1-19 Facility Loopback on a Circuit Source STM-N Port

Caution Performing a loopback on an Unlocked circuit is service-affecting.

Complete the "Create the Facility (Line) Loopback on the Source Optical Port" procedure.

Create the Facility (Line) Loopback on the Source Optical Port

Step 1 Connect an optical test set to the port you are testing.

Note For specific procedures to connect, set up, and use the test set equipment, consult the manufacturer.

Use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. The transmit and receive terminals connect to the same port. Adjust the test set accordingly.

Step 2 In CTC node view, double-click the card to display the card view.

Step 3 Click the Maintenance > Loopback > Port tabs.

Step 4 Choose Locked,maintenance from the Admin State column for the port being tested. If this is a multiport card, select the appropriate row for the desired port.

Step 5 Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport card, select the appropriate row for the desired port.

Step 6 Click Apply.

Step 7 Click Yes in the confirmation dialog box.

Note It is normal for a "LPBKFACILITY (STM1E, STMN)" condition, page 2-155 to appear during loopback setup. The condition clears when you remove the loopback.

Step 8 Complete the "Test and Clear the Facility (Line) Loopback Circuit" procedure.

Test and Clear the Facility (Line) Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the facility loopback:

a. Click the Maintenance > Loopback > Port tabs.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 4 Complete the "Test the Optical Card" procedure.

Test the Optical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card installed.

Step 3 If the test set indicates a good circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 Clear the facility (line) loopback:

a. Click the Maintenance > Loopback > Port tabs.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 6 Complete the "Perform a Terminal (Inward) Loopback on a Source-Node Optical Port" procedure.

1.3.2  Perform a Terminal (Inward) Loopback on a Source-Node Optical Port

The terminal (inward) loopback test is performed on the source-node optical port. For the circuit in this example, the destination STM-N port in the source node. You first create a bidirectional circuit that starts on the node source optical port and loops back on the node destination optical port. You then proceed with the terminal loopback test. Completing a successful terminal loopback to a node destination port verifies that the circuit is good up to the destination port. Figure 1-20 shows an example of a terminal loopback on a source-node STM-N port.

Figure 1-20 Terminal Loopback on a Source-Node STM-N Port

STM-N cards placed in terminal loopback state display an icon in the CTC graphical user interface (GUI), shown in Figure 1-21.

Figure 1-21 Terminal Loopback Indicator

Caution Performing a loopback on an Unlocked circuit is service-affecting.

Complete the "Create the Terminal (Inward) Loopback on a Source-Node Optical Port" procedure.

Create the Terminal (Inward) Loopback on a Source-Node Optical Port

Step 1 Connect an optical test set to the port you are testing:

Note For specific procedures to connect, set up, and use the test set equipment, consult the manufacturer.

a. If you just completed the "Perform a Facility (Line) Loopback on a Source-Node Optical Port" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source-node port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the terminal (inward) loopback circuit on the port being tested:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type and size, such as VC HO.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as STMN1toSTMN2.

e. Leave the Bidirectional check box checked. Leave the default value for State.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.

k. In the VC Optimization dialog box, leave all defaults.

l. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list and is described in the Dir column as a two-way circuit.

Note It is normal for the "LPBKTERMINAL (STM1E, STMN)" condition, page 2-159 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the terminal (inward) loopback on the destination port being tested:

a. In node view, double-click the card that requires the loopback, such as the destination optical card in the source node.

b. Click the Maintenance > Loopback > Port tabs.

c. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

d. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Terminal Loopback Circuit" procedure.

Test and Clear the Terminal Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the terminal loopback state on the port:

a. Double-click the card in the source node with the terminal loopback.

b. Click the Maintenance > Loopback > Port tabs.

c. Click None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 Complete the "Test the Optical Card" procedure.

Test the Optical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card.

Step 3 If the test set indicates a good circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 Clear the terminal loopback on the source card port before testing the next segment of the network path:

a. Double-click the source-node card with the terminal loopback.

b. Click the Maintenance > Loopback > Port tabs.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 Complete the "Perform an XC Loopback on the Source Optical Port" procedure.

1.3.3  Perform an XC Loopback on the Source Optical Port

Note This procedure is only performed on STM-N cards and cross-connect cards.

Note You can perform an XC loopback on either the circuit source working or the protect port of a 1+1 protection group.

The cross-connect (XC) loopback test occurs on the XC-VXL cross-connect card in a network circuit. Completing a successful XC loopback from an optical card through the cross-connect card eliminates the cross-connect card as the source of trouble for a faulty circuit. Figure 1-22 shows an example of an XC loopback path on a source STM-N port.

Figure 1-22 XC Loopback on a Source STM-N Port

Complete the "Create the XC Loopback on the Source STM-N Port" procedure.

Create the XC Loopback on the Source STM-N Port

Step 1 Connect an optical test set to the port you are testing:

Note For specific procedures to connect, set up, and use the test set equipment, consult the manufacturer.

a. If you just completed the "Perform a Terminal (Inward) Loopback on a Source-Node Optical Port" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. The transmit and receive terminals connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to put the circuit being tested out of service:

a. In node view, click the Circuits tab.

b. Click the circuit and then click Edit.

c. In the Edit Circuit dialog box, click the State tab.

d. Choose Locked,maintenance from the Target Circuit State drop-down list.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Use CTC to set up the XC loopback on the circuit being tested:

a. In node view, double-click the optical card to display the card view.

b. Click the Maintenance > Loopback > VC4 tabs.

c. Click the check box in the XC Loopback column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.'

Step 5 Complete the "Test and Clear the XC Loopback Circuit" procedure.

Test and Clear the XC Loopback Circuit

Note This procedure is performed only on optical cards.

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the cross-connect. Clear the XC loopback:

a. In card view, click the Maintenance > Loopback > VC4 tabs.

b. Uncheck the check box in the XC Loopback column for the circuit being tested.

c. Click Apply.

d. Click Yes in the confirmation dialog box.

Step 4 Complete the "Test the Standby XC-VXL Cross-Connect Card" procedure.

Test the Standby XC-VXL Cross-Connect Card

Note This procedure is performed only on XC cards.

Step 1 Perform a reset on the standby cross-connect card:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. Position the cursor over the standby cross-connect card.

c. Right-click and choose RESET CARD.

d. Click Yes in the confirmation dialog box.

Step 2 Initiate an external switching command (side switch) on the cross-connect cards before you retest the loopback circuit:

Caution Cross-connect side switches are service-affecting. Any live traffic on any card in the node endures a hit of up to 50 ms.

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In the node view, select the Maintenance > Cross-Connect > Card tabs.

c. In the Cross-Connect Cards area, click Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 3 Resend test traffic on the loopback circuit.

The test traffic now travels through the alternate cross-connect card.

Step 4 If the test set indicates a faulty circuit, assume the cross-connect card is not causing the problem. Clear the XC loopback circuit:

a. Click the Circuits tab.

b. Choose the XC loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

e. Confirm that the XC loopback circuit is deleted form the Circuits tab list. If the test set indicates a good circuit, the problem might be a defective cross-connect card.

Step 5 To confirm a defective original cross-connect card, complete the "Retest the Original XC-VXL Cross-Connect Card" procedure.

Retest the Original XC-VXL Cross-Connect Card

Note This procedure is performed only on STM-N and XC cards.

Step 1 Initiate an external switching command (side switch) on the cross-connect cards:

a. Determine the standby cross-connect card. On both the physical node and the CTC node view window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED is green.

b. In node view, select the Maintenance > Cross-Connect > Card tabs.

c. In the Cross-Connect Cards area, click Switch.

d. Click Yes in the Confirm Switch dialog box.

Note After the active cross-connect goes into standby mode, the original standby card becomes active and its ACT/STBY LED turns green. The former active card becomes standby and its ACT/STBY LED turns amber.

Step 2 Resend test traffic on the loopback circuit.

Step 3 If the test set indicates a faulty circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Proceed to Step 5. If the circuit is not shown to be faulty and the card is not shown to be defective, you are finished with testing.

Step 5 Complete the "Physically Replace an In-Service Cross-Connect Card" procedure on page 2-242 for the defective cross-connect card and perform Step 6.

Step 6 If the test set indicates a good circuit, the cross-connect card might have had a temporary problem that was cleared by the side switch. Clear the XC loopback circuit:

a. Click the Circuits tab.

b. Choose the XC loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 Complete the "Perform a Facility (Line) Loopback on an Intermediate-Node Optical Port" procedure.

1.3.4  Perform a Facility (Line) Loopback on an Intermediate-Node Optical Port

Performing the facility (line) loopback test on an intermediate port isolates whether this node is causing circuit failure. In the situation shown in Figure 1-23, the test is being performed on an intermediate STM-N port.

Figure 1-23 Facility Loopback Path to an Intermediate-Node STM-N Port

Caution Performing a loopback on an Unlocked circuit is service-affecting.

Complete the "Create the Facility (Line) Loopback on an Intermediate-Node Optical Port" procedure.

Create the Facility (Line) Loopback on an Intermediate-Node Optical Port

Step 1 Connect an optical test set to the port you are testing:

Note For specific procedures to connect, set up, and use the test set equipment, consult the manufacturer.

a. If you just completed the "Perform an XC Loopback on the Source Optical Port" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source-node port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the facility (line) loopback on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type and size, such as a VC HO.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as STMN1toSTMN3.

e. Leave the Bidirectional check box checked. Leave the default value for State.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.

l. If the VC Optimization dialog box appears, leave all defaults.

m. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list and that it is described in the Dir column as a two-way circuit.

Note It is normal for a "LPBKFACILITY (STM1E, STMN)" condition, page 2-155. The condition clears when you remove the loopback.

Step 5 Create the facility (line) loopback on the destination port being tested:

a. Go to the node view of the intermediate node:

•From the View menu choose Go To Other Node.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the intermediate-node card that requires the loopback.

c. Click the Maintenance > Loopback > Port tabs.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Facility (Line) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Facility (Line) Loopback Circuit" procedure.

Test and Clear the Facility (Line) Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the facility loopback state on the port:

a. Click the Maintenance > Loopback > Port tabs.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 4 Clear the facility (line) loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 Complete the "Test the Optical Card" procedure.

Test the Optical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card installed.

Step 3 If the test set indicates a good circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 Clear the facility (line) loopback on the port:

a. Click the Maintenance > Loopback > Port tabs.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 6 Clear the facility loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 Complete the "Perform a Terminal (Inward) Loopback on an Intermediate-Node Optical Ports" procedure.

1.3.5  Perform a Terminal (Inward) Loopback on an Intermediate-Node Optical Ports

In the next trouble-shooting test, you perform a terminal loopback on the intermediate-node port to isolate whether the destination port is causing circuit trouble. In the example situation in Figure 1-24, the terminal loopback is performed on the intermediate optical port in the circuit. You first create a bidirectional circuit that originates on the source-node optical port and loops back on the node destination port. You then proceed with the terminal loopback test. If you successfully complete a terminal loopback on the node, this node is excluded from possible sources of circuit trouble.

Figure 1-24 Terminal Loopback Path to an Intermediate-Node STM-N Port

STM-N cards placed in facility loopback state display an icon, shown in Figure 1-25.

Figure 1-25 Facility Loopback Indicator

Caution Performing a loopback on an Unlocked circuit is service-affecting.

Complete the "Create the Terminal Loopback on Intermediate-Node Optical Ports" procedure.

Create the Terminal Loopback on Intermediate-Node Optical Ports

Step 1 Connect an optical test set to the port you are testing:

Note For specific procedures to connect, set up, and use the test set equipment, consult the manufacturer.

a. If you just completed the "Perform a Facility (Line) Loopback on an Intermediate-Node Optical Port" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the terminal (inward) loopback on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type and size, such as a VC HO.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as STM1toSTM4.

e. Leave the Bidirectional check box checked. Leave the default value for State.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.

l. If the VC Optimization dialog box appears, leave all defaults.

m. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list and that it is described as a two-way circuit in the Dir column.

Note It is normal for the "LPBKTERMINAL (STM1E, STMN)" condition, page 2-159 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the terminal loopback on the destination port being tested:

a. Go to the node view of the intermediate node:

•From the View menu choose Go To Other Node.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the card that requires the loopback.

c. Click the Maintenance > Loopback > Port tabs.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Optical Terminal Loopback Circuit" procedure.

Test and Clear the Optical Terminal Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the terminal loopback on the port:

a. Double-click the intermediate-node card with the terminal loopback.

b. Click the Maintenance > Loopback > Port tabs.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 Complete the "Test the Optical Card" procedure.

Test the Optical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card.

Step 3 If the test set indicates a good circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the defective card.

Step 5 Clear the terminal loopback on the port:

a. Double-click the source-node card with the terminal loopback.

b. Click the Maintenance > Loopback > Port tabs.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 Complete the "Perform a Facility (Line) Loopback on a Destination-Node Optical Port" procedure.

1.3.6  Perform a Facility (Line) Loopback on a Destination-Node Optical Port

You perform a facility (line) loopback test at the destination port to determine whether this local port is the source of circuit trouble. The example in Figure 1-26 shows a facility loopback being performed on an STM-N port.

Figure 1-26 Facility Loopback Path to a Destination-Node STM-N Port

Caution Performing a loopback on an Unlocked circuit is service-affecting.

Complete the "Create the Facility (Line) Loopback on a Destination-Node Optical Port" procedure.

Create the Facility (Line) Loopback on a Destination-Node Optical Port

Step 1 Connect an optical test set to the port you are testing. For specific procedures to use the test set equipment, consult the manufacturer.

a. If you just completed the "Perform a Terminal (Inward) Loopback on an Intermediate-Node Optical Ports" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the hairpin circuit on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type and size, such as VC HO.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as STMN1toSTMN5.

e. Leave the Bidirectional check box checked. Leave the default value for State.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.

l. If the VC Optimization dialog box appears, leave all defaults.

m. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list and that it is described in the Dir column as a two-way circuit.

Note It is normal for the "LPBKFACILITY (STM1E, STMN)" condition, page 2-155 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the facility (line) loopback on the destination port being tested:

a. Go to the node view of the destination node:

•From the View menu choose Go To Other Node.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the card that requires the loopback, such as the destination-node optical, G-Series, MXP, or TXP card.

c. Click the Maintenance > Loopback > Port tabs.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Note It is normal for the "LPBKFACILITY (STM1E, STMN)" condition, page 2-155 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 6 Complete the "Test and Clear the Facility (Line) Loopback Circuit" procedure.

Test the Optical Facility (Line) Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the facility loopback on the port:

a. Click the Maintenance > Loopback > Port tabs.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 4 Clear the facility loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 Complete the "Test the Optical Card" procedure.

Test the Optical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card installed.

Step 3 If the test set indicates a good circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 Clear the facility (line) loopback on the port:

a. Click the Maintenance > Loopback > Port tabs.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 6 Clear the facility loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 Complete the "Perform a Terminal Loopback on a Destination-Node Optical Port" procedure.

1.3.7  Perform a Terminal Loopback on a Destination-Node Optical Port

The terminal loopback at the destination-node port is the final local hardware error elimination in the circuit troubleshooting process. If this test is completed successfully, you have verified that the circuit is good up to the destination port. The example in Figure 1-27 shows a terminal loopback on an intermediate-node destination STM-N port.

Figure 1-27 Terminal Loopback Path to a Destination-Node STM-N Port

Caution Performing a loopback on an Unlocked circuit is service-affecting.

Complete the "Create the Terminal Loopback on a Destination-Node Optical Port" procedure.

Create the Terminal Loopback on a Destination-Node Optical Port

Step 1 Connect an optical test set to the port you are testing:

Note For instructions to use the test-set equipment, consult the manufacturer.

a. If you just completed the "Perform a Facility (Line) Loopback on a Destination-Node Optical Port" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the terminal loopback on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type and size, such as a VC HO.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as STMN1toSTMN6.

e. Leave the Bidirectional check box checked. Do not change the State default value.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.

l. If the VC Optimization dialog box appears, leave all defaults.

m. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list and that it is described in the Dir column as a two-way circuit.

Note It is normal for the "LPBKTERMINAL (STM1E, STMN)" condition, page 2-159 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the terminal loopback on the destination port being tested:

a. Go to the node view of the destination node:

•From the View menu choose Go To Other Node.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the card that requires the loopback, such as the destination-node optical, G-Series, MXP, or TXP card.

c. Click the Maintenance > Loopback > Port tabs.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Optical Terminal Loopback Circuit" procedure.

Test and Clear the Optical Terminal Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the terminal loopback on the port:

a. Double-click the intermediate-node card with the terminal loopback.

b. Click the Maintenance > Loopback > Port tabs.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 The entire circuit path has now passed its comprehensive series of loopback tests. This circuit qualifies to carry live traffic. If the test set indicates a faulty circuit, the problem might be a faulty card.

Step 6 Complete the "Test the Optical Card" procedure.

Test the Optical Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card.

Step 3 If the test set indicates a good circuit, the problem is probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the defective card.

Step 5 Clear the terminal loopback on the port:

a. Double-click the source-node card with the terminal loopback.

b. Click the Maintenance > Loopback > Port tabs.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

The entire circuit path has now passed its comprehensive series of loopback tests. This circuit qualifies to carry live traffic.

1.4  Troubleshooting Ethernet Circuit Paths With Loopbacks

Terminal loopbacks, hairpin circuits, and terminal loopbacks can be used in the order shown in this section to troubleshoot an Ethernet circuit path for the G-Series card. E-Series and ML-Series do not have this capability in Software Release 6.0. The example in this section tests a G1000 circuit on a three-node MS-SPRing. Using a series of facility (line) loopbacks and terminal (inward) loopbacks, the example scenario traces the circuit path, tests the possible failure points, and eliminates them. The logical progression contains six network test procedures:

Note The test sequence for your circuits will differ according to the type of circuit and network topology.

1. A facility (line) loopback on the source-node Ethernet port

2. A terminal (inward) loopback on the source-node Ethernet port

3. A facility (line) loopback on the intermediate-node Ethernet port

4. A terminal (inward) loopback on the intermediate-node Ethernet port

5. A facility (line) loopback on the destination-node Ethernet port

6. A terminal (inward) loopback on the destination-node Ethernet port

Note Facility and terminal loopback tests require on-site personnel.

1.4.1  Perform a Facility (Line) Loopback on a Source-Node Ethernet Port

The facility (line) loopback test is performed on the node source port in the network circuit. In the testing situation used in this example, the source G1000 port in the source node. Completing a successful facility (line) loopback on this port isolates the G1000 port as a possible failure point. Figure 1-28 shows an example of a facility loopback on a circuit source Ethernet port.

Figure 1-28 Facility (Line) Loopback on a Circuit Source Ethernet Port

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the "Create the Facility (Line) Loopback on the Source-Node Ethernet Port" procedure.

Create the Facility (Line) Loopback on the Source-Node Ethernet Port

Step 1 Connect an optical test set to the port you are testing. For instructions to use the test-set equipment, consult the manufacturer.

Use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. The transmit and receive terminals connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 In CTC node view, double-click the card to display the card view.

Step 4 Click the Maintenance > Loopback tab.

Step 5 Choose Locked,maintenance from the Admin State column for the port being tested. If this is a multiport card, select the appropriate row for the desired port.

Step 6 Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport card, select the appropriate row for the desired port.

Step 7 Click Apply.

Step 8 Click Yes in the confirmation dialog box.

Note It is normal for a "LPBKFACILITY (G1000)" condition on page 2-154 to appear during loopback setup. The condition clears when you remove the loopback.

Step 9 Complete the "Test and Clear the Facility (Line) Loopback Circuit" procedure.

Test and Clear the Facility (Line) Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the facility (line) loopback:

a. Click the Maintenance > Loopback tab.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 4 Complete the "Test the Ethernet Card" procedure.

Test the Ethernet Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card installed.

Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 Clear the facility (line) loopback:

a. Click the Maintenance > Loopback tab.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 6 Complete the "Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port" procedure.

1.4.2  Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port

The terminal (inward) loopback test is performed on the node source Ethernet port. For the circuit in this example, it is the source G1000 port in the source node. You first create a bidirectional circuit that starts on the node destination G1000 port and loops back on the node source G1000 port.You then proceed with the terminal loopback test. Completing a successful terminal loopback to a node source port verifies that the circuit is good to the source port. Figure 1-29 shows terminal loopback on a G-Series port.

Figure 1-29 Terminal (Inward) Loopback on a G-Series Port

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the "Create the Terminal (Inward) Loopback on a Source-Node Ethernet Port" procedure.

Create the Terminal (Inward) Loopback on a Source-Node Ethernet Port

Step 1 Connect an optical test set to the port you are testing:

Note For instructions to use the test-set equipment, consult the manufacturer.

a. If you just completed the "Perform a Facility (Line) Loopback on a Source-Node Ethernet Port" procedure, leave the optical test set hooked up to the Ethernet port in the source node.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the terminal (inward) loopback on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type, such as VC_HO, and number, such as 1.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as G1K1toG1K2.

e. Leave the Bidirectional check box checked.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.

Note It is normal for the "LPBKTERMINAL (G1000)" condition on page 2-158 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the terminal (inward) loopback on the destination port being tested:

a. In node view, double-click the card that requires the loopback, such as the destination G1000 card in the source node.

b. Click the Maintenance > Loopback tab.

c. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

d. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Ethernet Terminal Loopback Circuit" procedure.

Test and Clear the Ethernet Terminal Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the terminal loopback state on the port:

a. Double-click the card in the source node with the terminal loopback.

b. Click the Maintenance > Loopback tab.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 Complete the "Test the Ethernet Card" procedure.

Test the Ethernet Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card.

Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the defective card.

Step 5 Clear the terminal loopback on the port before testing the next segment of the network circuit path:

a. Double-click the card in the source node with the terminal loopback.

b. Click the Maintenance > Loopback tab.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Clear the terminal loopback circuit before testing the next segment of the network circuit path:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 Complete the "Perform a Facility (Line) Loopback on an Intermediate-Node Ethernet Port" procedure.

1.4.3  Perform a Facility (Line) Loopback on an Intermediate-Node Ethernet Port

Performing the facility (line) loopback test on an intermediate port isolates whether this node is causing circuit failure. It is shown in Figure 1-30.

Figure 1-30 Facility (Line) Loopback on an Intermediate-Node Ethernet Port

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the "Create a Facility (Line) Loopback on an Intermediate-Node Ethernet Port" procedure.

Create a Facility (Line) Loopback on an Intermediate-Node Ethernet Port

Step 1 Connect an optical test set to the port you are testing:

Note For instructions to use the test-set equipment, consult the manufacturer.

a. If you just completed the "Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source port port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the facility (line) loopback on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type, such as VC_HO, and number, such as 1.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as G1KtoG1K3.

e. Leave the Bidirectional check box checked.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.

Note It is normal for the "LPBKFACILITY (G1000)" condition on page 2-154 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the facility (line) loopback on the destination port being tested:

a. Go to the node view of the intermediate node:

•Choose View > Go To Other Node from the menu bar.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the intermediate-node card that requires the loopback.

c. Click the Maintenance > Loopback tab.

d. Select OOS,MT from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Facility (Line) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Ethernet Facility (Line) Loopback Circuit" procedure.

Test and Clear the Ethernet Facility (Line) Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility (line) loopback. Clear the facility loopback from the port:

a. Click the Maintenance > Loopback tab.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 4 Clear the facility (line) loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 Complete the "Test the Ethernet Card" procedure.

Test the Ethernet Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card installed.

Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 Clear the facility (line) loopback from the port:

a. Click the Maintenance > Loopback tab.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 6 Clear the facility loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 Complete the "Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet Port" procedure.

1.4.4  Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet Port

In the next troubleshooting test, you perform a terminal loopback on the intermediate-node port to isolate whether the destination port is causing circuit trouble. In the example situation in Figure 1-31, the terminal loopback is performed on an intermediate Ethernet port in the circuit. You first create a bidirectional circuit that originates on the source-node Ethernet port and loops back on the intermediate-node port. You then proceed with the terminal loopback test. If you successfully complete a terminal loopback on the node, this node is excluded from possible sources of circuit trouble.

Figure 1-31 Terminal Loopback on an Intermediate-Node Ethernet Port

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the "Create a Terminal Loopback on an Intermediate-Node Ethernet Port" procedure.

Create a Terminal Loopback on an Intermediate-Node Ethernet Port

Step 1 Connect an optical test set to the port you are testing:

Note For instructions to use the test-set equipment, consult the manufacturer.

a. If you just completed the "Perform a Facility (Line) Loopback on an Intermediate-Node Ethernet Port" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the terminal (inward) loopback on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type, such as VC_HO, and number, such as 1.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as G1K1toG1K4.

e. Leave the Bidirectional check box checked.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list and that it is described in the Dir column as a two-way circuit.

Note It is normal for the "LPBKTERMINAL (G1000)" condition on page 2-158 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the terminal loopback on the destination port being tested:

a. Go to the node view of the intermediate node:

•Choose View > Go To Other Node from the menu bar.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the card that requires the loopback.

c. Click the Maintenance > Loopback tab.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Ethernet Terminal Loopback Circuit" procedure.

Test and Clear the Ethernet Terminal Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the terminal loopback from the port:

a. Double-click the intermediate-node card with the terminal loopback to display the card view.

b. Click the Maintenance > Loopback tab.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 Complete the "Test the Ethernet Card" procedure.

Test the Ethernet Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card.

Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the defective card.

Step 5 Clear the terminal loopback on the port:

a. Double-click the source-node card with the terminal loopback.

b. Click the Maintenance > Loopback tab.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 7 Complete the "Perform a Facility (Line) Loopback on a Destination-Node Ethernet Port" procedure.

1.4.5  Perform a Facility (Line) Loopback on a Destination-Node Ethernet Port

You perform a facility (line) loopback test at the destination port to determine whether this local port is the source of circuit trouble. The example in Figure 1-32 shows a facility loopback being performed on an Ethernet port.

Figure 1-32 Facility (Line) Loopback on a Destination-Node Ethernet Port

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the "Create the Facility (Line) Loopback on a Destination-Node Ethernet Port" procedure.

Create the Facility (Line) Loopback on a Destination-Node Ethernet Port

Step 1 Connect an optical test set to the port you are testing:

Note For instructions to use the test-set equipment, consult the manufacturer.

a. If you just completed the "Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet Port" procedure, leave the optical test set hooked up to the source-node port.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the hairpin circuit on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type, such as VC_HO, and number, such as 1.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as G1K1toG1K5.

e. Leave the Bidirectional check box checked.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.

Note It is normal for a "LPBKFACILITY (G1000)" condition on page 2-154 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the facility (line) loopback on the destination port being tested:

a. Go to the node view of the destination node:

•Choose View > Go To Other Node from the menu bar.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the card that requires the loopback.

c. Click the Maintenance > Loopback tab.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Facility (Line) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Ethernet Facility (Line) Loopback Circuit" procedure.

Test and Clear the Ethernet Facility (Line) Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the facility (line) loopback from the port:

a. Click the Maintenance > Loopback tab.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 4 Clear the facility (line) loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 5 Complete the "Test the Ethernet Card" procedure.

Test the Ethernet Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 3 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 4 Clear the facility (line) loopback on the port:

a. Click the Maintenance > Loopback tab.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 5 Clear the facility loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

Step 6 Complete the "Perform a Terminal Loopback on a Destination-Node Ethernet Port" procedure.

1.4.6  Perform a Terminal Loopback on a Destination-Node Ethernet Port

The terminal loopback at the destination-node port is the final local hardware error elimination in the circuit troubleshooting process. If this test is completed successfully, you have verified that the circuit is good up to the destination port. The example in Figure 1-33 shows a terminal loopback on an intermediate-node destination Ethernet port.

Figure 1-33 Terminal Loopback on a Destination-Node Ethernet Port

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the "Create the Terminal Loopback on a Destination-Node Ethernet Port" procedure.

Create the Terminal Loopback on a Destination-Node Ethernet Port

Step 1 Connect an optical test set to the port you are testing:

Note For instructions to use the test-set equipment, consult the manufacturer.

a. If you just completed the "Perform a Facility (Line) Loopback on a Destination-Node Ethernet Port" procedure, leave the optical test set hooked up to the source port.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the terminal loopback on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type, such as VC_HO, and number, such as 1.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as G1K1toG1K6.

e. Leave the Bidirectional check box checked.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the test set is connected.

h. Click Next.

i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the source dialog box.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.

Note It is normal for the "LPBKTERMINAL (G1000)" condition on page 2-158 to appear during a loopback setup. The condition clears when you remove the loopback.

Step 5 Create the terminal loopback on the destination port being tested:

a. Go to the node view of the destination node:

•Choose View > Go To Other Node from the menu bar.

•Choose the node from the drop-down list in the Select Node dialog box and click OK.

b. In node view, double-click the card that requires the loopback.

c. Click the Maintenance > Loopback tab.

d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

f. Click Apply.

g. Click Yes in the confirmation dialog box.

Step 6 Complete the "Test and Clear the Ethernet Terminal Loopback Circuit" procedure.

Test and Clear the Ethernet Terminal Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the terminal loopback from the port:

a. Double-click the intermediate-node card with the terminal loopback.

b. Click the Maintenance > Loopback tab.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

The entire circuit path has now passed its comprehensive series of loopback tests. This circuit qualifies to carry live traffic.

Step 5 If the test set indicates a faulty circuit, the problem might be a faulty card.

Step 6 Complete the "Test the Ethernet Card" procedure.

Test the Ethernet Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good card.

Step 2 Resend test traffic on the loopback circuit with a known-good card.

Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the defective card.

Step 5 Clear the terminal loopback on the port:

a. Double-click the source-node card with the terminal loopback.

b. Click the Maintenance > Loopback tab.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 6 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.

The entire circuit path has now passed its comprehensive series of loopback tests. This circuit qualifies to carry live traffic.

1.5  Troubleshooting MXP, TXP, or FC_MR-4 Circuit Paths With Loopbacks

The MXP, TXP, and FC_MR-4 loopback test for circuit path failure differs from electrical, optical, and Ethernet testing in that loopback testing does not require circuit creation. MXP, TXP, and FC_MR-4 client ports are statically mapped to the trunk ports so no signal needs to traverse the cross-connect card (in a circuit) to test the loopback.

You can use these procedures on transponder cards (TXP, TXPP), muxponder cards (MXP, MXPP), and FC_MR-4 cards. The example in this section tests a circuit on a three-node MS-SPRing. Using a series of facility (line) loopbacks, hairpin circuits, and terminal (inward) loopbacks, the example scenario traces the circuit path, tests the possible failure points, and eliminates them. The logical progression contains six network test procedures:

1. A facility (line) loopback on the source-node MXP/TXP/FC_MR-4 port

2. A terminal (inward) loopback on the source-node MXP/TXP/FC_MR-4 port

3. A facility (line) loopback on the intermediate-node MXP/TXP/FC_MR-4 port

4. A terminal (inward) loopback on the intermediate-node MXP/TXP/FC_MR-4 port

5. A facility (line) loopback on the destination-node MXP/TXP/FC_MR-4 port

6. A terminal (inward) loopback on the destination-node MXP/TXP/FC_MR-4 port

Note Loopbacks are not available for DWDM cards in this release.

Note MXP and TXP card client ports do not appear in the Maintenance > Loopback tab unless they have been provisioned. To provision TXP and MXP pluggable port modules (PPMs), refer to the "Provision Transponder and Muxponder Cards" chapter in the Cisco ONS 15454 DWDM Installation and Operations Guide.

Note The test sequence for your circuits will differ according to the type of circuit and network topology.

Note Facility, hairpin, and terminal loopback tests require on-site personnel.

1.5.1  Perform a Facility (Line) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port

The facility (line) loopback test is performed on the node source port in the network circuit. In the testing situation used in this example, the source muxponder or transponder MXP/TXP/FC_MR-4 port in the source node. Completing a successful facility (line) loopback on this port isolates the MXP/TXP/FC_MR-4 port as a possible failure point. Figure 1-34 shows an example of a facility loopback on a circuit source MXP/TXP/FC_MR-4 port.

Figure 1-34 Facility (Line) Loopback on a Circuit Source MXP/TXP/FC_MR-4 Port

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the "Create the Facility (Line) Loopback on the Source-Node MXP/TXP/FC_MR-4 Port" procedure.

Create the Facility (Line) Loopback on the Source-Node MXP/TXP/FC_MR-4 Port

Step 1 Connect an optical test set to the port you are testing.

Note For instructions to use the test-set equipment, consult the manufacturer.

Use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. The transmit and receive terminals connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 In CTC node view, double-click the card to display the card view.

Step 4 Click the Maintenance > Loopback tab.

Step 5 Choose Locked,maintenance from the Admin State column for the port being tested. If this is a multiport card, select the appropriate row for the desired port.

Step 6 Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport card, select the appropriate row for the desired port.

Step 7 Click Apply.

Step 8 Click Yes in the confirmation dialog box.

Note It is normal for a "LPBKFACILITY (FCMR)" condition on page 2-154 to appear during loopback setup. The condition clears when you remove the loopback.

Step 9 Complete the "Test and Clear the MXP/TXP/FC_MR-4 Facility (Line) Loopback Circuit" procedure.

Test and Clear the MXP/TXP/FC_MR-4 Facility (Line) Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the facility (line) loopback:

a. Click the Maintenance > Loopback tab.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 4 Complete the "Test the MXP/TXP/FC_MR-4 Card" procedure.

Test the MXP/TXP/FC_MR-4 Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.

Step 2 Resend test traffic on the loopback circuit with a known-good card installed.

Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective card to Cisco through the RMA process. Log into the Cisco Technical Support Website at http://www.cisco.com/techsupport for more information or log into http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco TAC numbers for your country.

Step 4 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the faulty card.

Step 5 Clear the facility (line) loopback:

a. Click the Maintenance > Loopback tab.

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the Admin State column for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

Step 6 Complete the "Perform a Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port" procedure.

1.5.2  Perform a Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port

The terminal (inward) loopback test is performed on the source-node MXP/TXP/FC_MR-4 port. For the circuit in this example, it is the source MXP/TXP/FC_MR-4 port in the source node. Completing a successful terminal loopback to a node source port verifies that the circuit is good to the source port. Figure 1-35 shows an example of a terminal loopback on a source MXP/TXP/FC_MR-4 port.

Figure 1-35 Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port

Caution Performing a loopback on an in-service circuit is service-affecting.

Complete the "Create the Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port" procedure.

Create the Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port

Step 1 Connect an optical test set to the port you are testing:

Note For instructions to use the test-set equipment, consult the manufacturer.

a. If you just completed the "Perform a Facility (Line) Loopback on a Source-Node MXP/TXP/FC_MR-4 Port" procedure, leave the optical test set hooked up to the MXP/ TXP/FC_MR-4 port in the source node.

b. If you are starting the current procedure without the optical test set hooked up to the source port, use appropriate cabling to attach the transmit and receive terminals of the optical test set to the port you are testing. Both transmit and receive connect to the same port.

Step 2 Adjust the test set accordingly.

Step 3 In node view, double-click the card that requires the loopback, such as the destination STM-N card in the source node.

Step 4 Click the Maintenance > Loopback tab.

Step 5 Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row appropriate for the desired port.

Step 6 Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the row appropriate for the desired port.

Step 7 Click Apply.

Step 8 Click Yes in the confirmation dialog box.

Step 9 Complete the "Test and Clear the MXP/TXP/FC_MR-4 Port Terminal Loopback Circuit" procedure.

Test and Clear the MXP/TXP/FC_MR-4 Port Terminal Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.

Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information that the test set is capable of indicating.

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the terminal loopback state on the port:

a. Double-click the card in the source node with the terminal loopback.

b. Click the Maintenance > Loopback tab.

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the Admin State column for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Complete the "Test the MXP/TXP/FC_MR-4 Card" procedure.

Test the MXP/TXP/FC_MR-4 Card

Step 1 Complete the "Physically Replace a Traffic Card" procedure on page 2-242 for the suspected bad card and replace it with a known-good one.