Monitored muldem with self test of the monitor

Details Monitored muldem with self test of the monitor Monitored muldem with self test of the monitor

1980-06-03

1982-08-31

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 14, 371 71, H04J 314

Patent

active

043476007

ABSTRACT:
A muldem (100) has a monitor (101) for testing data path failures through the muldem (100) by comparing the latter's input and output. The monitor (101) tests itself by injecting errors into one of the compared data streams for detection thereof if the monitor (101) and comparing means (806, FIG. 13a and b) is operating properly. Error injection is particularly accomplished by an error generator (922, FIG. 14) synchronously clocked with a data stream (904) through an exclusive OR gate (938). The error generator (922) includes a free running gated oscillator (924) and a pair of ganged flip-flops (926, 928) toggled by a clock signal (936) recovered from the data stream (904).

REFERENCES:
patent: 3920919 (1975-11-01), Aillet
patent: 4149038 (1979-04-01), Pitroda et al.
patent: 4266293 (1981-05-01), Anderson et al.
"DMX-13A/B/C Digital Multiplexer/Demultiplexer", Brochure, Printed 1-19-79 USA.

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