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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.