Alcatel-Lucent 1643 AMS Operation Manual page 66

Alarm messages
AU-4 Alarm indication signal received
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Alarm identifier
Information
Alarm category
ASAP
Alarm severity
(default setting)
Reporting state
(default setting)
Local indications
Cause
Actions
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1-46
AU4cAIS
The receive signal contains AU-4-AIS, i.e. the entire VC-4 payload signal
including the AU-4 pointer has been replaced by an all-ones pattern.
AU-4-AIS indicates that a more severe incoming signal failure has been
detected in one of the network elements in the upstream direction.
Transmission
sdhHOPath
Information
Reported
–
In the upstream equipment a defect has been detected, and as a consequent
action, AIS has been inserted in the downstream direction.
Locally no actions need to be taken. Analyze the alarm state of the upstream
equipment and take appropriate measures.
Alcatel-Lucent - Proprietary
See notice on first page
365-312-803R7.2
Issue 4, May 2007