Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation
Guide That Contains This Content
[+] Expand All
[-] Collapse All

    LOS

    Table 1: Alarm Details

    Parameter

    Description

    Code

    los

    Description

    Loss of Signal: The local port has detected a loss of received signal power.

    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

    • The fiber input is disconnected.
    • The far-end interface is not yet provisioned.
    • The far-end transmit laser is disabled or has failed.

    Default Severity

    Critical

    Service Affecting

    Yes (true).

    Alarm Clearing

    See LOS.

    Related Fault Hierarchy

    See:

    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 Monitoring and reporting of this alarm for a wavelength channel is supported only on multiwavelength CFP transceivers.

    Clearing an LOS 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. Ensure that the light path on the optical line system, if it exists, is correctly provisioned and fault free.
    3. Check for and resolve the following problems:
      • The far-end transmitter is disabled or has failed.
      • The far-end interface is not provisioned.
    4. 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