Alcatel-Lucent 1643 AMS Operation Manual page 52

Alarm messages
2 Mbit/s 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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1-32
E12cLOS
There is no incoming signal on the 2 Mbit/s tributary port. This is detected by
the absence of transitions in the signal, that is, only zeros are received.
Transmission
pdhPS
Prompt
Reported
The red fault LED on the unit is flashing.
Possible causes are:
•
Interconnecting cabling contacts have a problem.
•
Receiver fault in indicated unit.
•
Fault in the transmitting equipment (for example wrong configuration of the
output power level).
•
Discontinuity in the intermediate cabling.
•
Erroneous routing of intermediate cabling.
•
Check tributary connections between the indicated unit, the connecting
panel, and the DDF (Digital Distribution Frame).
•
Check the tributary receiver port of the indicated unit by looping the data at
the DDF.
•
Check the transmitting equipment, including the configuration of the output
power level.
•
Check intermediate cabling.
If tributary timing mode is provisioned, then a Tributary Timing Reference
Switch Request is generated to switch over to another timing source.
If the 2 Mbit/s signal is byte-synchronously mapped into the VC-12 and time
slot 0 is terminated, then AIS is inserted in the downstream direction.
If the port is operated in ISDN mode, then RDI is inserted in the upstream
direction.
Alcatel-Lucent - Proprietary
See notice on first page
365-312-803R7.2
Issue 4, May 2007