About notifications
for
SONET/SDH describes the failures diagnosed for each element in SONET/SDH networks. The calculates which root-cause problems are causing symptomatic events and creates notifications
for the problem origin. The uses the relationships in the topology to calculate the impact that a root-cause problem in one element has on the elements and services that are
connected to, or depend on it.
When the receives alarms that relate to connections to elements that it does not manage, the performs special analysis to determine if a problem has occurred in the connected network. This is described in “Diagnosis of external failure” on page 73.
Protection
Schemes on page 95 provides detailed information about the protection schemes supported by the Optical Transport
Manager.