Cisco Cisco IGX 8400 Modules Troubleshooting Guide
BTM AIS (Blue) Errors
Document ID: 10844
Contents
Introduction
Prerequisites
Requirements
Components Used
Conventions
Error Definition
Error Example
Troubleshooting
Related Information
Prerequisites
Requirements
Components Used
Conventions
Error Definition
Error Example
Troubleshooting
Related Information
Introduction
This error applies to the IGX broadband trunk module (BTM) with T3, E3, and E1 backcards.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
This document is not restricted to specific software and hardware versions.
Conventions
For more information on document conventions, see the Cisco Technical Tips Conventions.
Error Definition
The Blue Signal, also known as an Alarm Indication Signal (AIS), indicates one of two problems:
Equipment upstream from the trunk interface is in alarm.
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Equipment upstream from the trunk interface is functional, but an intermediate device is in alarm.
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The term upstream refers to the relative position of a piece of transmission equipment in the network. The
BTM is:
BTM is:
Downstream from the nearest piece of transmission equipment in the receive direction.
•
Upstream from the nearest piece of transmission equipment in the transmit direction.
•
The T3 or DS3 Blue Signal or AIS is generated on all DS3 outputs of a higher order transmission system
during a complete system failure. A Blue Signal triggers to prevent unnecessary tributary alarms. A DS3 Blue
Signal (AIS) is a signal with the following:
during a complete system failure. A Blue Signal triggers to prevent unnecessary tributary alarms. A DS3 Blue
Signal (AIS) is a signal with the following: