Table Of Contents
G.732 Support for the Integrated Signaling Link Terminal
Information About G.732 Support for the Integrated SLT
ITU-T G.732 Support on the Cisco SLT
G.732 Alarm Detection Capabilities on E1 Interfaces
Configuring G.732 Support for the Integrated SLT
Enabling G.732 on the Cisco SLT
Configuration Examples for G.732 Support for the Integrated SLT
Enabling G.732 Functionality Example
Verifying G.732 Configuration Example
G.732 Support for the Integrated Signaling Link Terminal
This feature ports the existing International Telecommunication Union Telecommunication Standardization Sector (ITU-T) G.732 bit-error-rate (BER) detection and alarm processing functionality from the Cisco Signaling Link Terminal (SLT) onto the Cisco AS5350 and Cisco AS5400 network access server (NAS) platforms. This functionality is already available on the Cisco 2600 SLT and is now fully integrated into the Cisco AS5350 and Cisco AS5400 using 2-, 4-, or 8-PRI E1 dial feature cards (DFCs).
ITU-T G.732 support for the SLT is a fundamental requirement for passing homologation in many European countries. As an integral part of the Cisco PGW2200 architecture, the Cisco SLT provides Signaling System 7 (SS7) connectivity to the Cisco PGW2200 node.
This feature document describes the tasks required to port G.732 functionality to the Cisco SLT in the Cisco IOS software image and the trunk DFC firmware.
Feature Specifications for the G.732 Support for the Integrated Signaling Link Terminal Feature
12.2(15)T
This feature was introduced.
Cisco AS5350 and Cisco AS5400.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents
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Information About G.732 Support for the Integrated SLT
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Restrictions
Command-line interface (CLI) support to allow G.732 alarm processing is available only on the Cisco AS5350 and Cisco AS5400 platforms.
Information About G.732 Support for the Integrated SLT
The following concepts are helpful in understanding the G.732 Support for the Integrated Signaling Link Terminal feature:
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ITU-T G.732 Support on the Cisco SLT
The Cisco SLT enables you to reliably transport SS7 protocols across an IP network. The Cisco SLT uses the Cisco IOS SS7 SLT feature set, providing reliable interoperability with the Cisco PGW2200. The Cisco SLT is responsible for terminating the Message Transfer Part (MTP) 1 and MTP 2 layers of the SS7 protocol stack. Using the Cisco Reliable User Datagram Protocol (RUDP), the Cisco SLT backhauls, or transports, upper-layer SS7 protocols across an IP network to the Cisco PGW2200. The Cisco SLT is supported on the Cisco 2611, Cisco 2651, Cisco AS5350, and Cisco AS5400.
ITU-T G.732 is an extract from the ITU-T blue book that describes characteristics of primary pulse-code-modulation (PCM) multiplex equipment that operates at 2048 kbps (E1). The requirements that describe excessive bit error rate detected by monitoring the frame alignment signal (loss of frame alignment fault conditions) and subsequent alarming actions relate to the Cisco SLT.
For more information about G.732 support on the Cisco SLT, refer to the Cisco Signaling Link Terminal G.732 Support feature document for Cisco IOS Release 12.2(2)T on Cisco.com.
G.732 Alarm Detection Capabilities on E1 Interfaces
The G.732 Support for the Integrated Signaling Link Terminal feature adds a new value to the dsx1LineStatus variable of the RFC 1406 SNMP MIB:
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Cisco SLT
The Cisco SLT consists of a custom Cisco IOS software image running on a Cisco 2611, Cisco 2651 (4 SS7 links), Cisco AS5350, or Cisco AS5400.
This feature includes the following benefits:
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For more information about the Cisco SLT, refer to the Cisco Signaling Link Terminal documentation index on Cisco.com.
Cisco Integrated SLT
The integrated Cisco SLT feature pulls existing Cisco distributed MTP SS7 signaling architecture functionality—previously available only on Cisco 2600-based SLTs—directly onto a single Cisco AS5350 or Cisco AS5400 gateway. Like the Cisco 2600-based SLT, the integrated Cisco SLT backhauls upper-layer SS7 protocols across an IP network using RUDP, which terminate at the MTP1 and MTP2 layers of the SS7 protocol stack at the MGC.
For more information about this feature, refer to the Integrated Signaling Link Terminal document on Cisco.com.
Configuring G.732 Support for the Integrated SLT
The following section contains configuration tasks for the G.732 Support for the Integrated Signaling Link Terminal feature.
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Enabling G.732 on the Cisco SLT
To enable ITU-T G.732 functionality on the Cisco SLT, use the following commands.
SUMMARY STEPS
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DETAILED STEPS
Troubleshooting Tips
To verify whether G.732 functionality is enabled or disabled, use the show controller command in privileged EXEC mode. See the "Verifying G.732 Configuration Example" section for sample command output.
Configuration Examples for G.732 Support for the Integrated SLT
This section provides the following examples:
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Enabling G.732 Functionality Example
The following example enables G.732 processing and reporting for E1 controller 0/0:
controller e1 0/0g732 berVerifying G.732 Configuration Example
The following sample output from the show controller command verifies that G.732 functionality is enabled. This example shows that the E1 controller slot 4, port 0 is configured on a Cisco AS5400. The bold text in the output indicates that G.732 functionality is enabled.
Router# show controllers e1 4/0E1 4/0 is down.Applique type is Channelized E1 - balancedFar End Block Errors DetectedReceiver has loss of signal.alarm-trigger is not setVersion info of slot 4: HW:768, PLD Rev:1Framer Version:0x8Manufacture Cookie Info:EEPROM Type 0x0001, EEPROM Version 0x01, Board ID 0x03,Board Hardware Version 3.0, Item Number 73-3996-03,Board Revision A0, Serial Number JAB043507HL,PLD/ISP Version <unset>, Manufacture Date 26-Aug-2000.Framing is CRC4, Line Code is HDB3, Clock Source is Line.G732 BER detection enabled.Data in current interval (580 seconds elapsed):0 Line Code Violations, 0 Path Code Violations0 Slip Secs, 580 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 580 Unavail SecsThe following sample output from the show controllers command verifies the ITU-T G.732 functionality is disabled. This example indicates that G.732 on E1 interface slot 4, port 0 is disabled on a Cisco AS5400.
Router# show controllers e1 4/0E1 4/0 is down.Applique type is Channelized E1 - balancedFar End Block Errors DetectedReceiver has loss of signal.alarm-trigger is not setVersion info of slot 4: HW:768, PLD Rev:1Framer Version:0x8Manufacture Cookie Info:EEPROM Type 0x0001, EEPROM Version 0x01, Board ID 0x03,Board Hardware Version 3.0, Item Number 73-3996-03,Board Revision A0, Serial Number JAB043507HL,PLD/ISP Version <unset>, Manufacture Date 26-Aug-2000.Framing is CRC4, Line Code is HDB3, Clock Source is Line.Data in current interval (580 seconds elapsed):0 Line Code Violations, 0 Path Code Violations0 Slip Secs, 580 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 580 Unavail SecsAdditional References
For additional information related to the G.732 Support for the Integrated Signaling Link Terminal feature, see the following sections:
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Related Documents
Cisco 2600 series routers
Cisco AS5350 gateway
Cisco AS5400 gateway
How to use Cisco IOS commands to support voice, video, and fax applications
Cisco IOS Voice, Video, and Fax Command Reference, Release 12.2 T
Cisco SLT
Cisco SLT dual Ethernet support to the VSC
Cisco Signaling Link Terminal Dual Ethernet, Release 12.2(11)T
ITU-T G.732 support on the Cisco SLT
Cisco Signaling Link Terminal G.732 Support, Release 12.2(2)T
Components of dial and voice solutions that require SS7 signaling
Cisco SS7 Interconnect for Access Servers Solution Release 2.2
Cisco IOS software configuration
Cisco IOS Release 12.2
Standards
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.
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MIBs
RFC 1406 MIB—Adds a new value to the dsx1LineStatus variable of the RFC 1406 SNMP MIB:
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To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
1 Not all supported MIBs are listed.
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:
http://tools.cisco.com/ITDIT/MIBS/servlet/index
If Cisco MIB Locator does not support the MIB information that you need, you can also obtain a list of supported MIBs and download MIBs from the Cisco MIBs page at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
To access Cisco MIB Locator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
RFCs
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
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Technical Assistance
Command Reference
This section documents a modified command. All other commands used with this feature are documented in the Cisco IOS Release 12.2 T command reference publications.
g732 ber
To enable G.732 processing and reporting for the E1 controller, use the g732 ber command in controller configuration mode. To disable processing and reporting, use the no form of this command.
g732 ber
no g732 ber
Syntax Description
This command has no arguments or keywords.
Defaults
Disabled
Command Modes
Controller configuration
Command History
12.2(2)T
This command was introduced on the Cisco 2611.
12.2(15)T
This command was implemented on the Cisco AS5350 and Cisco AS5400.
Usage Guidelines
By default, G.732 processing and reporting is disabled to precent a change in E1 behavior for sites that do not want G.732 reporting. Once ITU-T G.732 processing and reporting is enabled, the E1 controller is placed in the DOWN state if the bit error rate (BER) on the line is greater than 10e-3. The controller is restored to the UP state if the BER drops below 10e-4 for longer than 2 seconds. When the G.732 alarm is declared, the transmitter sends a remote-alarm-indication (RAI) yellow alarm.
You can restore ITU-T G.732 functionality by performing a power cycle or a software reload.
Examples
The following example applies to a Cisco 2611 and shows enabled G.732 processing and reporting for E1 controller 0/0:
controller e1 0/0g732 berThe following example applies to a Cisco AS5400 with an 8-PRI E1 dial feature card (DFC) in slot 4:
controller e1 4/0g732 berRelated Commands
Glossary
BER—bit error rate. Ratio of received bits that contain errors.
CLI—command-line interface.
DFC—dial feature card.
E1—A digital carrier used to transmit a formatted signal at 2.048 MHz.
ITU-T—International Telecommunication Union Telecommunication Standardization Sector. International body that develops worldwide standards for telecommunications technologies.
MGC—media gateway controller.
NAS—network access server.
NMS—network management system.
PCM—pulse code modulation.
PRI—Primary Rate Interface.
RAI—remote alarm indication (yellow alarm).
SLT—Cisco Signaling Link Terminal.
SS7—Signaling System 7.
Note
Guest
