TU-12 Alarm indication signal received
...................................................................................................................................................................................................................................
Alarm identifier
TU12cAIS
Information
The VC-12 payload signal is replaced by the alarm indication signal. This is
detected by checking the TU-12 pointer bytes for an all-ones pattern.
Alarm category
Transmission
ASAP
sdhLOPath
Alarm severity
(default setting)
Information
Reporting state
(default setting)
Not Reported
Local indications
–
Cause
In the upstream equipment a defect has been detected, and as a consequent
action, AIS has been inserted in the downstream direction.
Actions
Locally no actions need to be taken. Analyze the alarm state of the upstream
equipment and take appropriate measures.
Note(s)
In the upstream direction, “VC-12 Remote Defect Indicator” is activated.
Alarm messages
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Alcatel-Lucent - Proprietary
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365-312-803R7.2
Issue 4, May 2007
Summary of Contents for 1643 AM
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