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.

Table 1. Notifications Generated by the Optical Transport Manager
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.
PTP	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.
HighOrder_Trail	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.
LowOrder_Circuit	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.