Table 1: Alarm Details
Loss of Light, Transmit: The optical power transmitted has dropped below the loss-of-light threshold.
DOL optical channels (see respective table below).
Related Fault Hierarchy
Table 2: DOL Optical Channels (OCHs)
where channel is an alphanumeric string.
where the range of n depends on the module and channel is an alphanumeric string.
Clearing a LoLightTx Alarm
Follow all applicable safety requirements as described in the BTI7800 Series Hardware Overview and Installation Guide.
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.)
- Retrieve statistics for the DOL OCH to view the value
Optical power receivedcounter, and then refer to DOL OCH power alarm thresholds:
show statistics current och:identifier
- Ensure that the upstream fiber connections are thoroughly clean and correctly connected.
- 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.