| 摘要 |
Methods and apparatus for generating and clearing an excessive bit error rate alarm are provided and utilize a window algorithm. Data blocks of telecommunications signal are monitored in an "idle state" (12). A counter counts the number of incoming blocks in a window such that the block having a code violation count (CV) meeting or exceeding a threshold (CVSET) (14). If the count meets or exceeds its own threshold (x) (26), an alarm state is entered and an alarm is set (30). Otherwise, the system returns to the "idle state" (27). In the alarm state, a clearing counter (CC) counts the number of incomming blocks in the window having a CV of CVCLRR or less (34). If the CC count meets a third threshold value (Y) (45), the alarm is cleared and the system returns to the idle state. Otherwise, the system reverts to the alarm state (47).
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