Cisco AS5850 Universal Gateway Card Guide - 24 Channelized T1/E1 Trunk Card [Cisco AS5800 Series Universal Gateways]

Table Of Contents

24 Channelized T1/E1 Trunk Card

Overview

Clocking

LED Indicators

Specifications

Connecting Trunk Card Cables

Verifying and Troubleshooting the Installation

Configuring the 24 Channelized T1/E1 Trunk Card

Basic Configuration

Configuring Input Impedance

Verifying Impedance

Using the Bantam Jacks for Test Port Functionality

Monitor Mode

24 Channelized T1/E1 Trunk Card

The Cisco AS5850 universal gateway supports channelized T1 (CT1) and E1 (CE1) ingress interfaces that provide a synchronous telecommunications interface in both North American and international environments. The 24 channelized T1/E1 trunk card supports 24 CT1 or CE1 connections, and the Cisco AS5850 can hold as many as two 24 channelized T1/E1 trunk cards per route switch controller (RSC).

This chapter describes card T1/E1 line functionality, connectors and LEDs, steps for verifying and troubleshooting your 24 channelized T1/E1 trunk card installation, and card specifications.

This chapter contains the following sections:

•Overview

•Connecting Trunk Card Cables

•Configuring the 24 Channelized T1/E1 Trunk Card

•Using the Bantam Jacks for Test Port Functionality

Overview

The 24 channnelized T1/E1 trunk card has three T1/E1 interfaces and each interface supports eight T1/E1 PRI ports. Each 24 channelized T1/E1 trunk card can be installed in Cisco AS5850 server slots 0 to 5 or 8 to 13. The 24 channelized T1/E1 trunk card contains all necessary functionality to terminate as many as 576 DS0 channels in T1 mode and 720 DS0 channels in E1 mode and uses onboard High-Level Data Link Control (HDLC) controllers to terminate digital ISDN calls. You can use the Bantam jacks on the face of the card to monitor a line.

Note You need a special cable to connect 8 RJ-45 T1/E1 lines to each CT1/CE1 interface on the card. Refer to the "Connecting Trunk Card Cables" section.

Note The twenty-four CE1 ports can be configured as 75- or 120-ohm lines. The factory default setting for the CE1 ports is 120 ohm. To choose input impedance for the E1 ports, use a software command to change the impedance. Refer to the "Configuring Input Impedance" section for more details.

Figure 2-1 shows the 24 channelized T1/E1 trunk card components.

Figure 2-1 24 Channelized T1/E1 Trunk Card

The 24 channelized T1/E1 trunk card performs the following functions:

•Terminates up to 24 T1/E1 lines

The 24 channelized T1/E1 trunk card provides physical termination for as many as twenty-four T1/E1 lines and connects to an external network termination (NT1) device.

•De-multiplexes calls

A framer removes framing and embedded signaling bits (or inserts them, depending on the direction of the flow), and the framer CPU sends the data stream to onboard time-division multiplexing (TDM) resources, which break out each call (DS0) and pass each call to an appropriate call termination resource. Digital calls are terminated onboard the 24 channelized T1/E1 trunk card on HDLC controllers, and analog modem-originated calls are passed over the dial shelf backplane TDM bus to an available modem resource. The system software controls port and HDLC resource management.

•Responds to time-sensitive signaling

Each individual T1/E1 connection can be used as the system clocking reference. Each 24 channelized T1/E1 trunk card can supply two clocks from any two of its 24 ports. You can assign priorities to these clocks or accept the default values assigned by the software.

•Processes counting information for performance monitoring

•Supports online insertion and removal (OIR)

The 24 channelized T1/E1 trunk card supports OIR, a feature that allows you to remove and replace trunk cards in the Cisco AS5850 while the system is operating, without disrupting other cards and their associated calls. If you remove a trunk card while the system is operating, all calls associated with the lines on that card are dropped. Calls being handled by other trunk or modem cards, however, are not affected. For more information, see the "Busyout Command" section on page 1-1.

The Cisco AS5850 supports a mixture of 24T1 and T3/216 trunk cards. Table 2-1 shows the possible trunk card configurations:

Table 2-1 Maximum Number of Trunk Cards

Chassis Trunk Type

First RSC

Second RSC

Total Trunk Cards Per Chassis

Total 324-port UPC

Total TrunkDS0s

Total DS0 Ports

24T1 only

2 24T1

2 24T1

4

8

2304

2592

T3 only

2 T3

2 T3

4

6

2688

2808

24T1/T3 combination

2 24T1

2 T3

4

7

2496

2700

24T1/T3 combination

1 24T1,
1 T3

1 24T1,
1 T3

4

8

2496

3024

24T1/T3 combination

1 24T1,
1 T3

2 T3

4

7

2592

2916

24T1/T3 combination

2 24T1

1 24T1,
1 T3

4

8

2400

2808

24E1 only

2 24E1

2 24E1

4

8

2880

2592

STM1 only

1STM1

1 STM1

2

10

4032

3240

24E1/STM1 combination

2 24E1

1 STM1

3

9

3456

2916

Note It is possible to add more trunk cards by disabling configuration checking. For more information about the dial-config-guidelines command, refer to the Cisco AS5850 Operations, Administration, Maintenance, and Provisioning Guide, available online at: http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/as5850/sw_conf/5850oamp/ index.htm

Note Mixing CT1 or CT3 and CTE1 in the same chassis is not supported. If this configuration guideline is violated, an error message appears on the RSC and the disallowed card is shut down.

Clocking

All Cisco AS5850 trunk cards use the same transmit clock. This clock can originate from the following sources:

•TDM clock source—A priority value from 1 through 50 that is applied to a clock source when multiple clock sources are used

•External clock source—A clock source external to the universal gateway

Clocks are prioritized by slot number. The highest-priority clock is selected from the card in slot 0 and is used as the default clock. If this clock fails, the highest-priority clock from the card in slot 1 becomes the default clock, and so forth.

The trunk card then forwards the clocks to the route switch controller. The route switch controller selects the highest-priority clock as the system primary clock, and the rest of the clocks remain in a prioritized backup queue.

Instead of using the default algorithm for clock selection, you can specify clocks through global configuration and select a maximum of two clocks per trunk card.

If you configure fewer than two clocks on a trunk card and all other configured clocks fail, clock selection resorts to the default algorithm on that card and the second clock is selected automatically.

LED Indicators

The 24 channelized T1/E1 trunk card front panels are designed with LED indicators (Figure 2-2) to provide trunk card status and port-level monitoring information.

Figure 2-2 24 Channelized T1/E1 Trunk Card LEDs

The two types of LEDs for the 24 channelized T1/E1 trunk cards are:

•Card-level LEDs, which provide status information for card maintenance

•Port-associated LEDs, which provide warning signals and configuration status for individual T1/E1 connections

All LEDs are visible from the front panel. (See Figure 2-2.)

Table 2-2 lists the 24 T1/E1 trunk card LEDs and their functions.

Table 2-2 24 channnelized T1/E1 trunk card LED Indicators

LED

Color

Description

SERIAL ACT

Off

The serial connector is not available.

Port LEDs

Yellow

Port-associated LEDs providing indication of local alarm, remote alarm, or loopback detected on the corresponding PRI line.

FCPU

Green

Framing data link (FDL)—Stays blinking when the associated FDL CPU is determined to be in good working condition; goes off or stays on when an error condition is found.

CPU/POWER

Green

24 channelized T1/E1 trunk card passed diagnostics, and the card CPU is operating properly.

Yellow

Comes on shortly after the card is powered on.¹ Card CPU diagnostics start when the card starts receiving power, and the LED remains yellow while the diagnostics run.

Off

Card not receiving power.

CALLS/MAINT

Green

The LED comes on when at least one active call is switched through the card's port handling circuits.

Yellow

Indicates card OIR status. The LED is yellow when the card has been busied out and has no calls, and may be removed without interrupting service.

Off

The CALLS/MAINT LED is not on if there is no traffic on the card and the card has not been busied out.

¹There is a slight delay from the time that power is applied to the card to the time that this LED comes on.

Specifications

Table 2-3 lists the 24 T1/E1 trunk card specifications.

Table 2-3 24 T1/E1 Trunk Card Specifications

Description

Specification

Dimensions H x W x L

15.4 x 0.08 x 18.7 in. (39.12 x 0.203 x 47.5 cm) without the carrier
15.5 x 1.23 x 19 in. (39.37 x 3.12 x 48.26 cm) with the carrier

Weight

8 lb (3.6 kg)

Transmission bit rate

1.544 Mbps (T1 mode), 2.048 Mbps (E1 mode)

Power requirements

-48 VDC at 2 A (power consumption: 3.3 VDC and 5 VDC)

Regulatory compliance and safety¹

CTR4, CTR12, CTR13, ACA TS001, TS016, EN60950, IEC60950, and AS3260

¹See also the regulatory compliance and safety document that shipped with your Cisco AS5850.

Connecting Trunk Card Cables

The 24 T1/E1 trunk cards provide a PRI port requiring an adaptor to accept as many as eight RJ-45 receptacles for T1 or E1 lines. To connect T1 or E1 lines, follow these steps:

Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information that accompanied this device.

Step 1 Attach the 8 T1/E1 PRI interface cable to the port labeled PRI on the front of the 24 channelized T1/E1 trunk card.

Step 2 Attach the RJ-45 end of the T1/E1 cable to an RJ-45 receptacle on the 8 T1/E1 PRI cable. (See Figure 2-3.)

Warning To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information that accompanied this device.

Warning Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end away from the router first. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information that accompanied this device.

Figure 2-3 24 T1/E1 Trunk Card RJ-45 Cable Connections

Step 3 Attach the network end of your T1/E1 cables to your network termination (NT1) device.

Note For cable pinouts and instructions for installing multiple cables to a bracket, see "Cabling Specifications."

Warning To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some LAN and WAN ports both use RJ-45 connectors. Use caution when connecting cables. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information that accompanied this device.

Verifying and Troubleshooting the Installation

When you first power on your Cisco AS5850 universal gateway, all LEDs go on while the system runs a series of diagnostics. After the system passes initial diagnostics, all LEDs go off. The LEDs then go on again as described in Table 2-4.

To complete the installation, verify that the trunk card LEDs operate properly by observing the LED states.

Table 2-4 24 Channelized T1/E1 Trunk Card LED Indicators

LED

Color

Description

SERIAL ACT

Off

The serial connector is not available.

Port LEDs

Yellow

Port-associated LEDs providing indication of local alarm, remote alarm, or loopback detected on the corresponding Primary Rate Interface (PRI) line.

FCPU

Green

Framing data link (FDL)—Stays blinking when the associated FDL CPU is determined to be in good working condition; goes off or stays on when an error condition is found.

CPU/POWER

Green

24 channelized T1/E1 trunk card passed diagnostics, and the card CPU is operating properly.

Yellow

Goes on shortly after the card is powered on.¹ Card CPU diagnostics start when the card starts receiving power, and the LED remains yellow while the diagnostics run.

Off

Card not receiving power.

CALLS/MAINT

Green

The LED goes on when at least one active call is switched through the card's port handling circuits.

Yellow

Indicates card OIR status. The LED is yellow when the card has been busied out and has no calls, and may be removed without interrupting service.

Off

The CALLS/MAINT LED does not go on if there is no traffic on the card and the card has not been busied out.

¹There is a slight delay from the time that power is applied to the card to the time that this LED goes on.

•All three FCPU LEDs are blinking.

If the FCPU LED is off, or continually on, wait while the auto-reload feature on the server card attempts to reload the trunk firmware. If the software fails to reload after the programmed number of times, assume that the failure is due to defective hardware. Return the card to the factory for replacement.

•The CPU/POWER LED is on and is yellow or green.

If the CPU/POWER LED remains off, verify that the card is seated properly.

If the CPU/POWER LED is yellow, diagnostics are still running on the 24 channelized T1/E1 trunk card. If the CPU/POWER LED stays yellow, contact TAC. To contact Cisco's Technical Assistance Center (TAC) refer to the "Obtaining Documentation" section on page xvi.

If the power LED comes on for other 24 channelized T1/E1 trunk cards in the server, try inserting the 24 channelized T1/E1 trunk card in a different slot. If none of the power LEDs come on, check your dial shelf power connections, power entry modules, and AC-input power supplies (if present).

•The CALLS/MAINT LED is on and is green or yellow.

If the CALLS/MAINT LED is off but the power LED is on, there is no traffic on the card.

Verify that the other cards in the server work properly. Verify that the card is seated properly. Try inserting the card in a different slot.

Tip For further installation troubleshooting information, refer to the Cisco AS5850 Universal Gateway Hardware Installation Guide.

Configuring the 24 Channelized T1/E1 Trunk Card

Note If you are replacing a card by installing a new card of the same type in the same slot, the system software recognizes the new card interfaces and brings them up automatically. No additional configuration is needed. If you are installing a trunk card in a slot other than the slot from which you just removed a trunk card, additional configuration is needed. Refer to the Cisco AS5850 Operations, Administration, Maintenance, and Provisioning Guide, available online at: http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/as5850/sw_conf/5850oamp/ index.htm

Basic Configuration

This section shows how to configure channelized T1 or E1. You can allocate the available channels for channelized E1 and T1 in the following ways:

•All channels can be configured to support ISDN PRI.

•If you are not running ISDN PRI, all channels can be configured to support robbed-bit signaling (also known as channel-associated signaling).

•All channels can be configured in a single channel group.

•Mix and match channels supporting ISDN PRI, channel grouping, and channel-associated signaling.

•Mix and match channels supporting ISDN PRI, channel grouping, and robbed-bit signaling across the same T1 line.

Note For configuration information about leased-line or nondial use, see the Configuration Fundamentals Configuration Guide, available online. You can access this document at: Cisco Product Documentation > Cisco IOS Software > Cisco IOS Software Release you are using > Configuration Guides and Command References > Configuration guide for your application

The following steps will configure a basic T1 or E1 controller:

Step 1 Use the enable command and password to enter privileged EXEC mode. You are in privileged EXEC mode when the prompt changes to Gateway#.
Gateway> enable
Password: password
Gateway# 
Step 2 Enter global configuration mode. You are in global configuration mode when the prompt changes to Gateway(config)#.
Gateway# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Gateway(config)#
Step 3 Enter controller configuration mode to configure your controller slot and port. Slot values range from 0 to 5 and 8 to 13. Port values range from 0 to 23 for T1 and E1.
Gateway(config)# controller [t1 | e1] slot/port
Gateway(config-controller)#
Step 4 Enter your telco's framing type for the CT1 controller: esf or sf.
Gateway(config-controller)# framing esf
or

Enter the framing type for the CE1 controller.
Gateway(config-controller)# framing crc4
Step 5 Define the line code as binary 8 zero substitution (B8ZS) for the CT1 controller.
Gateway(config-controller)# linecode b8zs
or
Define the line code as high-density bipolar 3 (HDB3) for the CE1 controller.
Gateway(config-controller)# linecode hdb3
Step 6 Return to privileged EXEC mode.
Gateway(config-controller)# Ctrl-Z
Gateway#
Tip To save the gateway configuration, save it to NVRAM.

Verify

To verify that your controller is up and running and no alarms have been reported:

•Enter the show controller command and specify the controller type, slot, and port numbers:
Gateway# show controller t1 1/7
T1 1/7 is up.
  No alarms detected.
  Framing is ESF, Line Code is B8ZS, Clock Source is Line Primary.
  Version info of slot 2:  HW: 2, Firmware: 14, NEAT PLD: 13, NR Bus PLD: 19
  Data in current interval (476 seconds elapsed):
     0 Line Code Violations, 0 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Total Data (last 24 hours)
     0 Line Code Violations, 0 Path Code Violations,
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
•Note the following:

–The controller must report being up.

–No errors should be reported.
If you are having trouble:

•First decide if the problem is because of the T1 or E1 line or with a specific channel group. If the problem is with a single channel group, you have a potential interface problem. If the problem is with the T1 or E1 line, or with all channel groups, you have a potential controller problem.

•To troubleshoot your E1 or T1 controllers, first check that the configuration is correct. The framing type and line code should match to what the service provider has specified. Then check channel group and PRI-group configurations, especially to verify that the time slots and speeds are what the service provider has specified. At this point, use the show controller t1 or show controller e1 command to check for T1 or E1 errors. Use the command several times to determine if error counters are increasing, or if the line status is continually changing. If this is occurring, you need to work with the service provider.

•Another common reason for failure is the dial-tdm-clock priority setting. The default setting is a free-running clock that causes clock slip problems if not set properly.

Configuring Input Impedance

Use the line-termination command to set the input impedance for the 24 channelized T1/E1 trunk card. Configure input impedance by using the following steps.

Step 1 Use the enable command and password to enter privileged EXEC mode. You are in privileged EXEC mode when the prompt changes to Gateway#.
Gateway> enable
Password: password
Gateway# 
Step 2 Enter global configuration mode. You are in global configuration mode when the prompt changes to Gateway(config)#.
Gateway# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Gateway(config)#

Step 3 Enter the controller number to configure.
Gateway(config)# controller e1 0/0
Gateway(config-controller)# 
Step 4 Set the input impedance to 75 ohms for the controller. The factory-set default is 120 ohms. Repeat Step 3 and Step 4 for the other controllers.
Gateway(config-controller)# line-termination 75-ohm
Step 5 Return to privileged EXEC mode.
Gateway(config-controller)# Ctrl-Z 
Gateway#
Verifying Impedance

To verify your impedance, enter the show running-config command. Note that 120 ohms is the default value and is not displayed in the configuration file. The following output is an abbreviated example of the relevant output after having entered the command line-termination 75-ohm for controller E1 0.
Gateway# show running-config 
Building configuration...
Current configuration:
!
.
. 
controller E1 0/0
 clock source free-running
 line-termination 75-ohm
 pri-group timeslots 1-31
!
controller E1 1/0
 clock source line secondary 1
 pri-group timeslots 1-31
.
.
.
end
Gateway# 
Using the Bantam Jacks for Test Port Functionality

Test port functionality is supported by Cisco IOS Release 12.1(2)XD and later releases.

Note For cable pinouts, refer to "Cabling Specifications."

Monitor Mode

The monitor mode is available on the 24 channelized T1/E1 trunk card and channelized T3 trunk cards.

If a controller does not go up, or there are a large number of errors associated with a specific controller, you might be able to determine whether the problem is in the server card or in an external line by using the test port. The three test ports are located on the front panel of the 24 channelized T1/E1 trunk card. Each test port is a set of Bantam jack connectors directly beneath the 8-port T1/E1 interface connector.

The Bantam jack connectors allow the connection of an external test device (for example, a FIREBERD test device) to monitor an individual circuit in monitor mode. (See Figure 2-4.)

Note Each test port can only monitor one T1 or E1 line at a time and can only monitor the 8 T1/E1 lines attached to the T1/E1 interface directly above it.

Use the test trunk monitor command to enable and disable passive monitoring on a specific T1/E1 controller:

Gateway# test trunk monitor on 3/2

Gateway# test trunk monitor off 3/2

Use the show trunk testport command to check which ports are being monitored:

Gateway# show trunk testport

For more information on software commands, see the Cisco AS5850 Operations, Administration, Maintenance, and Provisioning Guide, available online at http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/as5850/sw_conf/5850oamp/ index.htm.

Passive monitoring equipment is used to listen on the TX MON and RX MON jacks during regular operation to detect errors.

Connecting test equipment to the following Bantam jack connectors provides various functions:

•TX MON can monitor signals coming out of the T1/E1 port being monitored without interrupting normal data transmission.

•RX MON can monitor signals going in to the T1/E1 port being monitored without interrupting normal data reception.

Figure 2-4 24 T1/E1 Trunk Card Bantam Jacks

Warning To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some LAN and WAN ports both use RJ-45 connectors. Use caution when connecting cables. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information that accompanied this device.