Central monitoring system of a multiplex subscriber loop carrier

A central monitoring system of a multiplex subscriber loop carrier connecting a plurality of first subscriber lines respectively connected with subscriber terminals and a plurality of second subscriber lines connected to a local switch for switching the second subscriber lines, the multiplex subscriber loop carrier (SLC) comprising:

• a remote terminal (RT) including means for multiplexing/demultiplexing the first subscriber lines to and from a carrier line carrying a plurality of channels, and a first subscriber line tester (SLT1) operatively connected to the first subscriber lines for testing the first subscriber lines so as to detect a fault on one of the first subscriber lines, said first subscriber line tester transmitting fault information on said fault;
• and
• a central office terminal (COT) including means for multiplexing/demultiplexing the second subscriber lines to and from said carrier line, and a dummy fault generating circuit for representing said fault, upon receiving fault information on said fault via said carrier line from said first subscriber line tester, said dummy fault generating circuit being connected via a transfer switch to one of the second subscriber lines that corresponds to said first subscriber line having said fault thereon,
• the local switch comprising a second subscriber line tester (SLT2) for testing said second subscriber lines, said second subscriber line tester detecting said dummy fault generating circuit so as to provide a message informing that said fault is on said first subscriber line which corresponds to said second subscriber line having said dummy fault generating circuit connected thereto.