TU-12 Alarm indication signal received
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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
See notice on first page
365-312-803R7.2
Issue 4, May 2007
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