SSF
SSF (Server Signal Failure - OTU)
The OT port has detected an Optical Channel (Och) Server Signal Failure. A condition
that is treated as a Server Signal Failure (i.e., a Loss of Signal, LOS) was detected. Each
of the following conditions is treated as a Server Signal Failure:
• LOS-P (Loss of Signal – OTU)
• LOF (Loss of Frame – OTU)
• LOM (Loss of Multiframe – OTU)
These conditions may be caused by the following reasons:
• A misconnected, damaged or dirty fiber on the trail between the local OTUk receive
port and the far end transmitter
• OTS/OMS layer failure on the OCh trail
• The received power may not be within the acceptable range on the Far end input
Severity Not reported
Service affecting? No
Applicability 112SA1L, 112SCA1, 112SCX10, 112SX10L, 11DPE12, 11QPA4,
11STAR1, 11STMM10, 11STGE12, 43SCX4, 43STA1P, 43STX4,
43STX4P, 4DPA4
Corrective Action
This procedure details the corrective action for clearing the SSF declared on an OT port.
At the end of each step wait to see if the fault clears. If not, continue with the next step.
...................................................................................................................................................................................................
1
Retrieve power level reading on the local OT port.
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2
If power level is low on the DWDM facing port, identify the associated OCh trail and
verify the power levels along the OCh trail.
...................................................................................................................................................................................................
3
Identify the farthest upstream point relative to the far end OTUk port at which power
level falls within the expected range.
Trouble-clearing procedures
SSF
SSF (Server Signal Failure - OTU)
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2-294
1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
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