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LoLightTx

 

Table 1: Alarm Details

Parameter

Description

Code

loLightTx

Description/Cause

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

Entities Affected

DOL optical channels (see respective table below).

Default Severity

Major

Service Affecting

Yes (true).

Alarm Clearing

See Clearing a LoLightTx alarm.

Related Fault Hierarchy

See DOL OCH fault hierarchy.

Table 2: DOL Optical Channels (OCHs)

Entity Name

 

Fault Indicator

Module

Indicator

Status

och:<chassis>/<slot>/0/L1/<channel>

where channel is an alphanumeric string.

ROADM2

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

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

Clearing a LoLightTx Alarm

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 DOL OCH to view the value of the Optical power received counter, and then refer to DOL OCH power alarm thresholds:
    show statistics current och:identifier
  2. Ensure that the upstream fiber connections are thoroughly clean and correctly connected.
  3. Check for alarms on the DOL optical channel.
    • If the alarm has cleared, you have completed this procedure.

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