Alcatel-Lucent 1643 AMS Operation Manual page 228

Alarm messages
TU-3 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
Note(s)
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1-208
TU3cAIS
The VC-3 payload signal is replaced by alarm indication signal. This is
detected by checking the TU-3 pointer bytes for an all 1s pattern.
Transmission
sdhLOPath
Information
Not 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.
In the upstream direction, "VC-3 Remote Defect Indicator" is activated.
Alcatel-Lucent - Proprietary
See notice on first page
365-312-803R7.2
Issue 4, May 2007