Impact notifications

When the Optical Transport Manager diagnoses a root cause problem, it calculates whether the problem has caused service to be lost on end-to-end circuits that depend on the affected object. When service has been lost, the Optical Transport Manager creates the following notification:

• ServiceUnavailable on Circuit object

  Protection Schemes on page 95 provides more information.

  Impact of failures on circuits when protection is unavailable shows the context in which the Optical Transport Manager generates ServiceUnavailable root-cause notifications for circuits when there is either no protection, or multiple failures prevent successful protection switching.

Table 1. Impact of failures on circuits when protection is unavailable

Root-cause Notification	Element	Context
Down	Card or Equipment	Circuits passing through or depending on the Card or Equipment
Down	PTP	Circuits passing through the PTP.
Down or SignalDegrade	DropSideTopologicalLink	Circuits passing through the TopologicalLink.