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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
        statistics 
         threshold profile def-och  
          entityType och  
          statistic fec-ber alarmHigh unTimed  
           dblRaiseValue 2.700000000000000e-2  
           dblClearValue 2.300000000000000e-2  
         !
         threshold profile def-otu4  
          entityType otu4 
          statistic fec-ber alarmHigh unTimed  
           dblRaiseValue 4.500000000000000e-3 
           dblClearValue 7.500000000000000e-4  
         !
    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.

    Modified: 2017-07-06