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    OprLowTh

    Table 1: Alarm Details

    Parameter

    Description

    Code

    oprLowTh

    Description

    Optical Power Received Below Low Threshold: The optical power received is below the low threshold.

    Entities Affected

    • Optical channel interfaces (see respective table below).
    • OTN OTU interfaces (see respective table below).
    • Ethernet interfaces (see respective table below).
    • SONET/SDH interfaces (see respective table below).
    • Wavelength channels (see respective table below).

    Possible Causes

    • There is excessive attenuation on either the fiber link or the optical connection.
    • The far-end optical transmitter is faulty.

    Default Severity

    Major

    Service Affecting

    No (false).

    Alarm Clearing

    See Clearing an OprLowTh 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

    Table 3: OTN OTU Interfaces

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    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.

    Table 4: Ethernet Interfaces

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    100ge:<chassis>/<slot>/<subslot>/<port>/<subport>

    1x CFP BIC

    Fault LED, 100G port

    On

    100ge:<chassis>/<slot>/<1>/<port>

    UFM6

    Fault LED, 100G port

    10ge:<chassis>/<slot>/<1>/<port>/<subport>

    UFM6

    Fault LED, 10G port

    10ge:<chassis>/<slot>/<subslot>/<port>/<subport>

    12x SFP+ BIC

    Fault LED, 10G port

    Table 5: SONET/SDH Interfaces

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    oc192:<chassis>/<slot>/<subslot>/<port>

    12x SFP+ BIC

    Fault LED, 10G port

    On

    wanoc192:<chassis>/<slot>/<subslot>/<port>

    stm64:<chassis>/<slot>/<subslot>/<port>

    wanstm64:<chassis>/<slot>/<subslot>/<port>

    Table 6: Wavelength Channels

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    channel:<chassis>/<slot>/<subslot>/<port.channel>

    1x CFP BIC1

    Fault LED, 100G port

    On

    1 Reporting of this alarm for a wavelength channel is supported only on multiwavelength CFP transceivers.

    Clearing an OprLowTh Alarm

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

    1. Retrieve detailed information for the interface to determine whether the value of the Optical Power Rx counter is within the range indicated by the Optical Power Received Minimum Threshold and Optical Power Received Maximum Threshold values.
      show interface name:identifier detail
    2. Check for and clear alarms on the far-end optical transmitter.
    3. Check for alarms on the local interface.
      • If the alarm clears, you have completed this procedure.
      • If the alarm does not clear, go to the next step.
    4. Inspect the fiber at the local port, and ensure that it is intact, thoroughly clean, and correctly connected to the port.
    5. Check for alarms on the local interface.
      • If the alarm clears, you have completed this procedure.
      • If the alarm does not clear, contact your next level of support.

    Modified: 2017-10-24