Stm-1 Loss Of Input Signal - Alcatel-Lucent 1643 AMS Operation Manual

Alarm messages

STM-1 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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1-170
STM1cLOS
The power level of the STM-1 receive signal (optical or electrical) is below a
defined level and LOF is detected.
In previous releases of the 1643 AMS (releases prior to release 5.0), this alarm
may also indicate that an optical SFP module is not plugged.
Transmission
sdhPRS
Prompt
Reported
The red fault LED is flashing.
Possible causes of the alarm are:
•
Cable rupture
•
Dirty optical connector(s)
•
Equipment fault(s) in the upstream station
•
Previous releases of the 1643 AMS only: An optical SFP module is not
plugged.
Check operation of the transmitter in the far-end station.
Check for cable breaks or dirty connectors.
Previous releases of the 1643 AMS only: Check whether an optical SFP
module is unintentionally not plugged.
In the downstream direction, AIS is inserted.
In the upstream direction, "Multiplex Section - Remote Defect Indicator"
(MS-RDI) is inserted.
Alcatel-Lucent - Proprietary
See notice on first page
365-312-803R7.2
Issue 4, May 2007