Alcatel-Lucent 1643 AMS Operation Manual page 207

Alarm messages
STM-4 Loss of input signal
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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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365-312-803R7.2
Issue 4, May 2007
STM4cLOS
The power level of the received signal is below a defined level and LOF is
detected.
Transmission
sdhPRS
Prompt
Reported
•
The red fault LED is flashing.
•
In the upstream direction, MS-RDI is inserted.
•
In the assembly direction VC-4 path, AIS is inserted.
Possible causes are:
•
Cable rupture.
•
Dirty optical connector(s).
•
Equipment fault(s) in the upstream far-end station of the network element
that reported the alarm.
Check operation of the transmitter in the far-end station.
Check for cable breaks or dirty connectors.
In the upstream direction, "MS - Remote Defect Indicator" is activated.
Alcatel-Lucent - Proprietary
See notice on first page
1-187