Notifications and symptomatic events

Notifications Generated by the Optical Transport Manager lists the notifications generated by the Optical Transport Manager for low-order optical network elements and network connections in the SDH network.
Notifications Generated by the
Managed Element
Notification
Condition
Card
Down
A card in a network element has failed.
Equipment
Down
Equipment in a network element has failed.
PTP
Down
A PTP on a network card or equipment has failed.
PTPHardFailureCondition
A hard failure indication has been observed on this PTP.
OpticalNetworkElement
Down
The EMS has lost management connection with the NE.
DropSideTopologicalLink
Down
The drop side topological link is down.
HighOrder_Trail
TrailDown
This facility is down.
TrailAtRisk
One element of a protection group is down. Communication continues, but without the security of redundancy.
LowOrder_Circuit
ServiceUnavailable
This facility is down. May be a result of TransportOutgoingFail, TransportIncomingFail, or TransportFail.
ServiceAtRisk
One element of a protection group is down. Communication continues, but without the security of redundancy.
The following sections describe the root-cause problems and related symptoms for optical network elements and network connections.