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46. 发明专利

JPH07105818A SELECTOR MONITORING CIRCUIT 失效
公开(公告)号：JPH07105818A
公开(公告)日：1995-04-21
申请号：JP26819493
申请日：1993-09-29
申请人： NEC CORP
发明人： IMAI KUNIHIRO
IPC分类号： H01H63/36 , H04L29/04 , H04M3/26
摘要： PURPOSE:To monitor the usualness of a selector circuit and at the same time to monitor whether a selector control signal from a control part to a selector part is normal or not in a circuit having the selector part to select one main signal among (n) main signals after receiving control signals from the control part. CONSTITUTION:Pass pattern insertion circuits 81-8n in a pass pattern insertion part 7 insert sign information respectively particular for main signals. Based on the selector control signal produced in a control signal producing circuit 4 of a control part 2, a selector circuit 3 in a selector part 1 selects optional one signal among the main signals. A pass pattern decoding circuit 5 in the selector part 1 takes out particular information of a main signal sent out of the selector circuit 3, converts it into a corresponding selector control signal, and sends it to the control part 2. A comparison circuit 6 compares the selector control signal sent out of the selector part 1 with a selector control signal directly sent out of the control signal producing circuit 4 and in the case they are different, the abnormality of the selector control signal can be known by alarm.

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