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, 112SCX10, 112SX10L, 11DPE12, 11DPE12E,
11QPA4, 11STAR1, 11STMM10, 11STGE12, 43SCX4, 43STA1P,
43STX4, 43STX4P, 4DPA4
Corrective Action
This procedure details the corrective action for clearing the SSFODU 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.
...................................................................................................................................................................................................
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.
...................................................................................................................................................................................................
4
Check the alarms/conditions on the node located in Step 3 or the node immediately
upstream from point identified in Step 3.
...................................................................................................................................................................................................
5
Correct the problem identified in Step 4.
...................................................................................................................................................................................................
6
If all power levels along the OCh trails fall within the target range, locate the fiber
connected directly to receiver of the port which detects SSFODU condition.
...................................................................................................................................................................................................
7
Clean the fiber.
Trouble-clearing procedures
SSFODU
SSFODU (Server Signal Failure - ODU)
....................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................
2-296
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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