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    LOM

    Table 1: Alarm Details

    Parameter

    Description

    Code

    lom

    Description

    Loss of Multiframe: The multiframe alignment process is in the out-of-multiframe state.

    Entities Affected

    OTN OTU interfaces (see respective table below).

    Possible Causes

    • Either the fiber link or the optical connection is degraded.
    • The far-end optical transmitter is faulty.

    Default Severity

    Critical

    Service Affecting

    Yes (true).

    Alarm Clearing

    See Clearing an LOM alarm.

    Related Fault Hierarchy

    See OTN interface fault hierarchy.

    Table 2: OTN OTU Interfaces

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    otu4:<chassis>/<slot>/<2>/<1>/<subport.och.tributary>

    UFM6

    Fault LED, 200G line port

    On

    otu4:<chassis>/<slot>/<1>/<1>

    UFM4

    Fault LED, 100G line port

    On

    otu4:<chassis>/<slot>/<subslot>/<port>

    1x CFP BIC

    Fault LED, 100G port

    otu2:<chassis>/<slot>/<subslot>/<port>

    12x SFP+ BIC

    Fault LED, 10G port

    otu2e:<chassis>/<slot>/<subslot>/<port>

    Note: Supported on UFM3 only.

    Clearing an LOM Alarm

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

    1. Inspect the fiber connection, and ensure that the fiber is intact, thoroughly clean, and correctly connected to the port.
    2. Check for and clear all alarms on the far-end optical transmitter.
    3. Check for alarms on the local interface.
      • 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