BDI
Backward Defect Indication (BDI) - OTU
The OT port has detected a Backward Defect Indication at the OTUk Section layer. This
defect indicates that the peer OTUk port has detected a condition that is treated as Server
Signal Failure (conditions such as LOS, LOF or LOM would contribute to SSF)
This may be caused by the following reasons:
• A misconnected, damaged or dirty fiber on the trail between the local OTUk port
transmitter and the far end receiver
• OTS/OMS layer failure on the OCh trail
• The received power may not be within the acceptable range on the Far end input
Severity NA
Service affecting? No
Applicability 112SA1L, 112SCX10, 112SX10L, 11DPE12, 11DPE12E,
11QPA4, 11STAR1, 11STMM10, 11STGE12, 43SCX4, 43STA1P,
43STX4, 43STX4P, 4DPA4
This procedure details the corrective action for a BDI against the OT port.
At the end of each step wait to see if the fault clears. If not, continue with the next step.
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1
Check the alarms/conditions along the OCh trail.
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2
Identify the farthest upstream alarm/condition relative to the far end OTUk port.
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3
Follow the procedure for clearing the identified alarm/condition.
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4
If the peer OTUk port is in a client domain (this would be the case when BDI is detected
on a client OT port provisioned as OTU2), request corrective action by client operators.
Trouble-clearing procedures
BDI
Backward Defect Indication (BDI) - OTU
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1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
2-47
E ND OF STEPS
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