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    APR

    Table 1: Alarm Details

    Parameter

    Description

    Code

    apr

    Description

    Automatic Power Reduction: For safety reasons, the local port has automatically reduced laser power. For more information about APR, see the BTI7800 Series Software Configuration Guide.

    Entities Affected

    • DOL ports (see respective table below).
    • Terminal amplifier client and DCM ports (see respective table below).

    Possible Cause

    A fiber cut has been detected.

    Default Severity

    Critical

    Service Affecting

    Yes (true).

    Alarm Clearing

    See:

    Related Fault Hierarchy

    See:

    Table 2: DOL Ports

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    port:<chassis>/<slot>/1/PRE

    PRE

    Fault LED, PRE port

    On

    Table 3: Terminal Amplifier Ports

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    client:<chassis>/<slot>/1/<portNum>

    AMP1

    Fault LED, DCM port

    On

    dcm:<chassis>/<slot>/1/<portNum>

    Fault LED, C1 port

    Clearing an APR Alarm (PRE Port)

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

    1. Check for a LoLightRx alarm on the host module's PRE In port.
    2. Inspect the fiber at the following locations, and ensure that the fiber is intact, thoroughly clean, and correctly connected:
      • Between the PRE module's Out port and the host module's PRE In port.
      • Between the host module's PRE Out port and the PRE module's In port.
    3. Check for alarms on the PRE port.
      • If the alarm has cleared, you have completed this procedure.
      • If the alarm does not clear, contact your next level of support.

    Clearing an APR Alarm (terminal Amplifier Port)

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

    1. Do one of the following:
      • If the alarm is raised against the client Out port, retrieve statistics for the port to view the values of the APR optical backreflection and Optical power transmitted counters.
        show statistics current client:identifier
      • If the alarm is raised against the DCM Out port, check for a LoLightRx alarm on the DCM In port.
    2. Inspect the fiber, and ensure that it is intact, thoroughly clean, and correctly connected.
    3. Check for alarms on the terminal amplifier line port.
      • 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