Diagnosis of external failure

When the Optical Transport Manager receives alarms that relate connections from network elements managed by the Optical Transport Manager to those that are not managed by the Optical Transport Manager, special analysis is performed to determine if a problem has occurred in the connected network rather than in the managed network.

This additional analysis is performed for drop side topological links that have a Down notification. The following alarms are used in determining the existence of an external failure.

• LOS on the PTP connected to a DropSideTopologicalLink or BBDropSideTopologicalLink

• LOF on the PTP connected to a DropSideTopologicalLink or BBDropSideTopologicalLink

• AIS on the PTP connected to a DropSideTopologicalLink or BBDropSideTopologicalLink

• RFI on the PTP connected to a DropSideTopologicalLink

• RFI-P on the aEnd or zEnd CTP

• LOP-P on the aEnd or zEnd CTP

• AIS-P on the aEnd or zEnd CTP

• UNEQ-P on the aEnd or zEnd CTP

• TIM-P on the aEnd or zEnd CTP

• PLM-P on the aEnd or zEnd CTP

• PDI-P on the aEnd or zEnd CTP

• SSF-P on the aEnd or zEnd CTP

  When analysis shows that an external failure has occurred, two user-defined attributes are updated to show where the failure has occurred.

  The UserDefined1 attribute can take one of the following values:

• zEnd Customer Network - External Failure

• Service Provider Network - Internal Failure

• aEnd Customer Network - External Failure