摘要 |
A central monitoring system of a multiplex subscriber loop carrier has a remote terminal which includes a first subscriber line tester for testing first subscriber lines connected to subscriber terminals so as to detect a fault on a first subscriber line and outputting an alarm if the fault is detected. A central office terminal is connected to the remote terminal via a carrier line and to a local switch via second subscriber lines. The central office terminal includes a dummy fault generating circuit which represents the fault. Upon receiving the alarm via the carrier line, the dummy fault generating circuit is connected via a transfer switch to one of the second subscriber lines which corresponds to the first subscriber line having the fault thereon. Then, a second subscriber line tester provided in the local switch for testing the second subscriber lines detects the dummy fault generating circuit to provide a message informing that the fault is on the first subscriber line which corresponds to the second subscriber line having the dummy fault generating circuit connected thereto.
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