Secondary alarm filtering

Details Secondary alarm filtering Secondary alarm filtering

H - Electricity

04

B

H04B 17/00 (2006.01) H04J 3/14 (2006.01) H04L 12/24 (2006.01) H04Q 3/00 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2300753

A sub-network manager in a telecommunications network such as a synchronous digital hierarchy (SDH) or a synchronous optical network (SONET) filters out secondary (AIS) alarms generated in response to signals received by network elements on incoming links by determining (12, 13) whether the upstream termination point of the incoming link on which the signal was received is within the managed domain of the sub-network manager. If it is within the managed domain, the alarm is blocked (14). If the upstream termination point is outside the managed domain the alarm is processed further (15). In the latter case the secondary alarm may be the only indication of the fault causing the alarm that the sub-network manager receives, whereas in the former case it will have received notification from some other alarm, either a primary alarm, such as a loss of signal alarm (LOS) or an AIS alarm generated in response to a signal entering the managed domain from outside.

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