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 necessary to rob feeder voice or signaling channels to perform fault diagnosis.
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