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PreFecBerTh

 

Table 1: Alarm Details

Parameter

Description

Code

preFecBerTh

Description

Pre-FEC Bit Error Rate Above High Threshold: The pre-FEC bit error rate is above the high threshold.

Entities Affected

Optical channel interfaces (see respective table below).

Possible Cause

The link is degraded.

Default Severity

Minor

Service Affecting

No (false).

Alarm Clearing

See Clearing a PreFecBerTh alarm.

Related Fault Hierarchy

See Common fault hierarchy - OTN and CBR ports.

Table 2: Optical Channel Interfaces

Entity Name

 

Fault Indicator

Module

Indicator

Status

och:<chassis>/<slot>/<2>/<1>/<subport.och>

UFM6

Fault LED, 200G line port

On

Clearing a PreFecBerTh Alarm

Note

Follow all applicable safety requirements as described in the BTI7800 Series Hardware Overview and Installation Guide.

  1. Do the following:
    • Retrieve statistics for the interface to view the value of the FEC max bit error ratio counter:

      show statistics current name:identifier
    • Retrieve information from the running configuration file to view the statistics threshold-profile for the interface:

      show running-config statistics threshold profile

      Example

      bti7800# show running-config statistics threshold profile
  2. Do one of the following:
    • If the actual pre-FEC BER exceeds the RaiseValue value specified for the alarm, go to the next step.

    • If the actual pre-FEC BER does not exceed the RaiseValue specified for the alarm, contact your next level of support.

  3. Analyze the optical link, and resolve any problems that could be impacting the pre-FEC bit error rate.
  4. Check for alarms on the interface.
    • If the alarm clears, you have completed this procedure.

    • If the alarm does not clear, contact your next level of support.