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APR

 

Table 1: Alarm Details

Parameter

Description

Code

apr

Description

Automatic Power Reduction: For safety reasons, the local port has automatically reduced laser power. For more information about APR, see the BTI7800 Series Software Configuration Guide.

Entities Affected

  • DOL ports (see respective table below).

  • Terminal amplifier client and DCM ports (see respective table below).

Possible Cause

A fiber cut has been detected.

Default Severity

Critical

Service Affecting

Yes (true).

Alarm Clearing

See:

Related Fault Hierarchy

See:

Table 2: DOL Ports

Entity Name

 

Fault Indicator

Module

Indicator

Status

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

PRE

Fault LED, PRE port

On

Table 3: Terminal Amplifier Ports

Entity Name

 

Fault Indicator

Module

Indicator

Status

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

AMP1

Fault LED, DCM port

On

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

Fault LED, C1 port

Clearing an APR Alarm (PRE Port)

Note

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

  1. Check for a LoLightRx alarm on the host module's PRE In port.
  2. Inspect the fiber at the following locations, and ensure that the fiber is intact, thoroughly clean, and correctly connected:
    • Between the PRE module's Out port and the host module's PRE In port.

    • Between the host module's PRE Out port and the PRE module's In port.

  3. Check for alarms on the PRE port.
    • If the alarm has cleared, you have completed this procedure.

    • If the alarm does not clear, contact your next level of support.

Clearing an APR Alarm (terminal Amplifier Port)

Note

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

  1. Do one of the following:
    • If the alarm is raised against the client Out port, retrieve statistics for the port to view the values of the APR optical backreflection and Optical power transmitted counters.

      show statistics current client:identifier
    • If the alarm is raised against the DCM Out port, check for a LoLightRx alarm on the DCM In port.

  2. Inspect the fiber, and ensure that it is intact, thoroughly clean, and correctly connected.
  3. Check for alarms on the terminal amplifier line port.
    • If the alarm has cleared, you have completed this procedure.

    • If the alarm does not clear, contact your next level of support.