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

    LoLightRx

    Table 1: Alarm Details

    Parameter

    Description

    Code

    loLightRx

    Description/Cause

    Loss of Light, Receive: The optical power received has dropped below the loss-of-light threshold.

    Entities Affected

    • DOL PRE Ports (see respective table below).
    • DOL optical service channels (see respective table below).
    • DOL optical multiplex sections (see respective table below).
    • DOL optical channels (see respective table below).
    • Wavelength protection ports (see respective table below).
    • Terminal amplifier ports (see respective table below).

    Default Severity

    Critical

    Service Affecting

    Yes (true).

    Alarm Clearing

    See:

    Related Fault Hierarchy

    See:

    Note: For wavelength protection ports, this alarm is not masked by any other alarm.

    Table 2: DOL PRE Ports

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    port:<chassis>/<slot>/0/PRE

    PRE

    Fault LED, PRE port

    On

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

    Table 3: DOL Optical Service Channels (OSCs)

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    osc:<chassis>/<slot>/0/L1

    ROADM2 or ILA

    Fault LED, L1 port

    On

    osc:<chassis>/<slot>/0/C<n>

    where the range of n depends on the module.

    Fault LED, C<n> port

    Table 4: DOL Optical Multiplex Sections (OMSs)

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    oms:<chassis>/<slot>/0/L1<>

    ROADM2 or ILA

    Fault LED, L1 port

    On

    oms:<chassis>/<slot>/0/C<n>

    where the range of n depends on the module.

    Fault LED, C<n> port

    Table 5: DOL Optical Channels (OCHs)

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    och:<chassis>/<slot>/0/C<n>/<channel>

    where the range of n depends on the module and channel is an alphanumeric string.

    ROADM2

    Table 6: Wavelength Protection Ports

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    wpsport:<chassis>/<slot>/L<n>

    where n is in the range of 1A to 4A or 1B to 4B.

    WPS4

    Fault LED, Line<n> port

    On

    Table 7: Terminal Amplifier Ports

    Entity Name

     

    Fault Indicator

    Module

    Indicator

    Status

    osc:<chassis>/<slot>/1/<portNum>.<oscNum>

    AMP1

    On

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

    Fault LED, Line port

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

    Fault LED, DCM port

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

    Fault LED, C1 port

    Clearing a LoLightRx Alarm (DOL Entity)

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

    Note: In some ROADM network topologies with ILAs deployed, amplified spontaneous emissions (ASE) might accumulate sufficiently to cause this alarm to clear on provisioned but unoccupied optical channels. (The ASE will not be high enough to affect optical performance, however.)

    1. Retrieve statistics for the affected entity to view the value of the Optical power received counter:
      show statistics current name:identifier
    2. Do the following:
    3. Check for and resolve any of the following problems, and then go to 4:
      • The span fiber or patch panel fiber is cut or disconnected or has excessive loss.
      • The amplifier transmitting into the patch fiber has shut down.
      • There is excessive loss on each module that is connected to the alarmed port.
      • There is excessive loss on upstream patch fibers.
    4. Check for and resolve any of the following problems:
      • The far-end ROADM2 or ILA is not provisioned.
      • The far-end DOL OMS, DOL OSC, or DOL OCH is administratively disabled.
      • A fiber is either cut or disconnected.
    5. Check for alarms on the local DOL entity.
      • If the alarm has cleared, you have completed this procedure.
      • If the alarm does not clear, contact your next level of support.

    Clearing a LoLightRx Alarm (wavelength Protection Port)

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

    1. Retrieve information for the wavelength protection port to view the values of the received-loss-of-light threshold ( LoLightRx Th ) and the optical power received Opt.Pw.Rx counter:
      show protection wavelength port name:identifier
    2. Do the following:
      • Inspect the fiber connection, and ensure that the fiber is intact, thoroughly clean, and correctly connected to the port.
      • Check for and clear all alarms on the upstream NE.
    3. Check for alarms on the local port.
      • If the alarm has cleared, you have completed this procedure.
      • If the alarm does not clear, contact your next level of support.

    Clearing a LoLightRx Alarm (terminal Amplifier Port)

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

    1. Retrieve statistics for the port to view the value of the Optical power received counter:
      show statistics current name:identifier
    2. Check for and resolve any of the following problems:
      • The span fiber or patch panel fiber is cut or disconnected or has excessive loss.
      • The amplifier transmitting into the patch fiber has shut down.
      • There is excessive loss on each module that is connected to the alarmed port.
      • There is excessive loss on upstream patch fibers.
      • The far-end port is administratively disabled.
    3. Check for alarms on the local port.
      • If the alarm has cleared, you have completed this procedure.
      • If the alarm does not clear, contact your next level of support.

    Modified: 2017-10-24