Method for sorting secondary warning signals

Application Number: 00104958
Application Date: 2000.04.05
Publication Number: 1269646
Publication Date: 2000.10.11
Priority Information: 1999/4/7 EP 99302696.2
International: H04J3/14;H04L12/24;H04Q3/00
Applicant(s) Name: Lucent Science and Technology Co.
Inventor(s) Name: Neir Ruens Bass;Graham John Davis
Patent Agency Code: 11038
Patent Agent: jiang shixun
Abstract A sub-network manager in a telecommunications network such as a synchronous digital hierarchy or a synchronous optical network 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.