STM-4 MS Alarm indication signal received
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Alarm identifier MS4cAIS
Information When the Alarm Indication Signal (AIS) is received, then:
• The STM-4 MS contains all 1s (alarm indication signal).
• The upstream equipment has detected a defect and responded to it.
Alarm category Transmission
ASAP sdhMS
Alarm severity
(default setting)
Information
Reporting state
(default setting)
Reported
Local indications In the upstream direction, “Multiplex Section - Remote Defect Indicator”
(MS-RDI) is inserted.
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) There are no actions needed concerning the indicated network element; alarm
indication signal is only reported for information.
Alarm messages
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1-188
Alcatel-Lucent - Proprietary
See notice on first page
365-312-803R7.2
Issue 4, May 2007
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