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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

Service affecting?

Applicability

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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Check the alarms/conditions along the OCh trail.

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Identify the farthest upstream alarm/condition relative to the far end OTUk port.

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Follow the procedure for clearing the identified alarm/condition.

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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.

N D

O F

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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

112SA1L, 112SCX10, 112SX10L, 11DPE12, 11DPE12E,

11QPA4, 11STAR1, 11STMM10, 11STGE12, 43SCX4, 43STA1P,

43STX4, 43STX4P, 4DPA4

S T E P S

Backward Defect Indication (BDI) - OTU

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