Alcatel-Lucent 1643 AM, Operation Manual, Page: 51 / 386

2 Mbit/s Loss of frame alignment
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Alarm identifier P12ScLOF
Information At least three consecutive odd or three consecutive even frames contained
frame alignment signal errors. As a result, the frame structure is no longer
recognized at the tributary port of the indicated tributary unit.
Alarm category Transmission
ASAP pdhPS
Alarm severity
(default setting) Prompt
Reporting state
(default setting) Reported
Local indications
Cause Possible causes are:
•
Receiver fault in the indicated tributary unit
•
Transmitter fault in the upstream equipment.
Actions Check the upstream equipment generating the 2 Mbit/s frame alignment signal.
•
If a hardware failure is reported by that equipment then solve that problem
first.
•
If no failure is reported by the upstream equipment then loop the 2 Mbit/s
signal at the transmitting equipment and at the receiving equipment. The
node reporting 2 Mbit/s Loss of frame alignment contains the faulty unit.
Note(s) 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.
Alarm messages
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365-312-803R7.2
Issue 4, May 2007 Alcatel-Lucent - Proprietary
See notice on first page
1-31