Monitor system for multiplex equipment

Details Monitor system for multiplex equipment Monitor system for multiplex equipment

1989-09-29

1991-02-12

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 15, 370 84, 370112, 371 24, 371 71, H04J 314

Patent

active

049930133

ABSTRACT:
A monitor system for a multiplex equipment, comprising a multiplexing unit for multiplexing low speed group input signals of plural channels into a high speed group output signal and a demultiplexing unit for demultiplexing a high speed group input signal into low speed group output signals of plural channels, wherein the high speed group output signal and the low speed group input signals on one hand and the high speed group input signal and the low speed group output signals on the other hand are monitored through comparison on the basis of the low speed group signal. When discrepancy is detected in the comparison between the high speed group output signal and the low speed group input signal in a certain channel of the low speed group signal in the course of monitoring the multiplex unit, the comparison between the high speed input signal and the low speed output signal is performed in a different channel of the low speed group signal for monitoring the demultiplex unit. The time taken for making decision of the presence of fault from the detection of discrepancy in the comparison can be reduced, whereby exchange of the equipment suffering from the fault can be accomplished rapidly in response to the fault information, decreasing the shutdown duration involved in restoration.

REFERENCES:
patent: 3920919 (1975-11-01), Aillet
patent: 4345324 (1982-08-01), Smitt
patent: 4376998 (1983-03-01), Abbott et al.
patent: 4601028 (1986-07-01), Huffman et al.
patent: 4730302 (1988-03-01), Fuerlinger et al.
patent: 4908818 (1990-03-01), Kawano
"Multiplex Equipment In-Out Check", in the National Conference of the Institute of Electronics and Communication Engineers of Japan (1979), Article No. 2036.

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