| 摘要 |
A fault diagnosis apparatus (3, 7) for a telecommunication system (1) that transmits and cross-connects telephone signals between multiple telephone central office feeder lines (2) and telephone subscriber equipment (10) operates by retransmitting telephone signals received from the feeder lines in a digital time multiplex format at a transmission rate sufficiently fast so as to create a plurality of spare time slot channels in a retransmission frame which are available for fault diagnosis purposes. Accordingly, it is not neccessary to rob feeder voice or signaling channels to perform fault diagnosis. |
