Table Of Contents
Configuring AIS on Channelized T1E1-CEM
First Published: April 15, 2009
This document describes the Alarm Indication Signal (AIS) on channelized T1/E1 circuit emulation (CEM) over IP feature. This feature is supported on the NM-CEM-4T1E1 module.
The following Cisco Integrated Service Routers (ISRs) are supported:
•Cisco 3800 Series ISRs
•Cisco 2800 Series ISRs
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.
The following are prerequisites to configuring the AIS on Channelized T1E1 feature:
•You must be familiar with Cisco IOS software
Overview of Alarm Indication Signal on Failure
This feature allows an AIS alarm to be sent on the T1/E1 line when a CEM transitions to the down state. Typically, this is used to signal to the equipment connected to the CEM that the CEM is in a failed state. This allows the end equipment to trigget switchover to a standby link.
Note By default, this feature is disabled. To use this feature, you must enable it using the ais-on-failure command.
When the feature is enabled and the CEM transitions to a down state, an AIS alarm is sent on the corresponding T1/E1 line. When the CEM transitions back to the up state, the AIS alarm is removed.
How to Configure AIS on CEM
To configure the AIS on channelized T1 or E1 CEM feature, follow this procedure:
The following sections provide references related to the Cisco NM-CEM-T1E1 Module
Related Topic Document Title
This section documents new commands.
To enable alarm indication signal (AIS) if there is a cable loss or malfunction and the CEM transitions to a down state, use the ais-on-failure command.
Use the no form of this command to disable AIS.
By default, AIS is disabled.
You can verify the updated AIS state by using the show run command .
The following example shows output from the ais-on-failure command:
From the UUT side:====================cem 2/0/1dejitter-buffer 100ais-on-failurexconnect 220.127.116.11 0 encapsulation udplocal ip addr 18.104.22.168local udp port 15906remote udp port 16034!Router#sh controller e1 2/0E1 2/0 is up.Applique type is Channelized E1 - balancedTransmitter is sending AIS. <<<<<<<< When CEM is down and AIS is on.Receiver has no alarms.alarm-trigger is not setVersion info Firmware: 00000000, FPGA: 0Framing is CRC4, Line Code is HDB3, Clock Source is Internal.CRC Threshold is 320. Reported from firmware is 320.CEIPNM specific information:
From CPE side:==================Router#*Mar 1 08:28:56.861: %CONTROLLER-5-UPDOWN: Controller E1 0/3/0, changed state to down (AIS detected)bsky_3825_r1#sh Controller E1 0/3/0E1 0/3/0 is down.Applique type is Channelized E1 - balancedReceiver is getting AIS. <<<<<<<<alarm-trigger is not set
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