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    LoLightTx

    Table 1: Alarm Details

    Parameter

    Description

    Code

    loLightTx

    Description/Cause

    Loss of Light, Transmit: The optical power transmitted has dropped below the loss-of-light threshold.

    Entities Affected

    DOL optical channels (see respective table below).

    Default Severity

    Major

    Service Affecting

    Yes (true).

    Alarm Clearing

    See Clearing a LoLightTx alarm.

    Related Fault Hierarchy

    See DOL OCH fault hierarchy.

    Table 2: DOL Optical Channels (OCHs)

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    och:<chassis>/<slot>/0/L1/<channel>

    where channel is an alphanumeric string.

    ROADM2

    och:<chassis>/<slot>/0/C<n>/<channel>

    where the range of n depends on the module and channel is an alphanumeric string.

    Clearing a LoLightTx Alarm

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

    Note: In some ROADM network topologies with ILAs deployed, amplified spontaneous emissions (ASE) might accumulate sufficiently to cause this alarm to clear on provisioned but unoccupied optical channels. (The ASE will not be high enough to affect optical performance, however.)

    1. Retrieve statistics for the DOL OCH to view the value of the Optical power received counter, and then refer to DOL OCH power alarm thresholds:
      show statistics current och:identifier
    2. Ensure that the upstream fiber connections are thoroughly clean and correctly connected.
    3. Check for alarms on the DOL optical channel.
      • If the alarm has cleared, you have completed this procedure.
      • If the alarm does not clear, contact your next level of support.

    Modified: 2017-07-06