Monitoring apparatus capable of monitoring a digital equipment b

Details Monitoring apparatus capable of monitoring a digital equipment b Monitoring apparatus capable of monitoring a digital equipment b

1985-12-10

1987-12-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 15, 3701101, H04J 116, H04J 312

Patent

active

047122099

ABSTRACT:
In a monitoring apparatus for monitoring digital equipment including an on-line multiplexer for multiplexing a plurality of input signals into a single output signal, an on-line demultiplexer for demultiplexing a single input signal into a plurality of output signals, and off-line multiplexer and demultiplexer substitutable for the on-line multiplexer and demultiplexer, respectively, a pattern signal generator supplies the off-line multiplexer and demultiplexer with a monitoring signal of a predetermined pattern identical with a synchronization signal included in each of the plurality of input signals and the plurality of output signals. The monitoring signal is circulated through the off-line multiplexer and demultiplexer and is supplied to a monitoring circuit as a circulated signal. The monitoring circuit detects presence or absence of the predetermined pattern in the circulated signal to monitor occurrence of failure in the off-line multiplexer and demultiplexer. On monitoring the on-line multiplexer, a subsidiary multiplexed signal which is identical to the single output signal and sent from the on-line multiplexer through the off-line demultiplexer to the monitoring circuit as a first demultiplexed signal. The monitoring circuit monitors presence or absence of the predetermined pattern in the first demultiplexed signal. On monitoring the on-line demultiplexer, a second demultiplexed signal is selected from the plurality of output signals and sent to the monitoring circuit so as to detect presence or absence of the predetermined pattern in the second demultiplexed signal.

REFERENCES:
patent: 4376998 (1983-03-01), Abbott et al.
patent: 4562574 (1985-12-01), Kambayashi
patent: 4601028 (1986-07-01), Huffman et al.
patent: 4606019 (1986-08-01), Takai

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