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    OptLowTh

    Table 1: Alarm Details

    Parameter

    Description

    Code

    optLowTh

    Description

    Optical Power Transmitted Below Low Threshold: The optical power transmitted 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 Cause

    The transmit laser is failing.

    Default Severity

    Major

    Service Affecting

    No (false).

    Alarm Clearing

    See Clearing an OptLowTh 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 OptLowTh Alarm

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

    Note: Refer to the BTI7800 Series Hardware Overview and Installation Guide before replacing equipment.

    1. Retrieve detailed information for the interface to determine whether the value of the Optical Power Tx counter is within the range indicated by the Optical Power Transmitted Minimum Threshold and Optical Power Transmitted Maximum Threshold values.
      show interface name:identifier detail
    2. Replace either the pluggable transceiver installed in the port or, if the alarm is raised against an interface provisioned on an integrated MSA, the UFM.
    3. Check for alarms on the 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