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    PosRxLow

    Table 1: Alarm Details

    Parameter

    Description

    Code

    posRxLow

    Description

    Receive Power Out of Specification, Low: The optical power received is below the specified range for operation.

    Entities Affected

    • DOL optical multiplex sections (see respective table below).
    • DOL optical channels (see respective table below).

    Possible Cause

     

    Default Severity

    Major

    Service Affecting

    Yes (true).

    Alarm Clearing

    See Clearing a PosRxHigh alarm.

    Related Fault Hierarchy

    See:

    Table 2: DOL Optical Multiplex Sections (OMSs)

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    oms:<chassis>/<slot>/0/L1<>

    ROADM2 or ILA

    oms:<chassis>/<slot>/0/C<n>

    where the range of n depends on the module.

    Table 3: 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 n depends on the module and channel is an alphanumeric string.

    Clearing a PosRxLow Alarm

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

    1. Retrieve statistics for the DOL entity:
      show statistics current name:identifier
    2. Refer to DOL OCH power alarm thresholds or DOL OMS power alarm thresholds to determine whether the optical power received for the entity is lower than the specified range for operation.
    3. If the optical power received is too low, do the following to bring the power up to a level within the range, retrieving statistics for the entity after each task:
      • Clean the fibers connected to the affected ports.
      • Change the patch cord fiber.
      • Check the source of the entity to determine whether it is transmitting at an adequate level.
      • Check the fibers and any attenuators in the path to ensure that no unintentional attenuation has been added to the path.
    4. Check for alarms on the DOL entity.
      • 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