Automatic in-service digital trunk checking circuit and method

Details Automatic in-service digital trunk checking circuit and method Automatic in-service digital trunk checking circuit and method

1975-12-29

1977-05-10

Stewart, David L.

1791752R, H04J 314

Patent

active

040229793

ABSTRACT:
The integrity of switched, time-division multiplexed digital trunks in a telephone switching system is verified on an individual and in-service basis wherein the digital check is accomplished incident to the conventional D.C. network path continuity verification by the switching system common controller. The terminal circuits serving the channel allow a common multiplexer-demultiplexer to insert a test code during the allocated time slot of the channel being tested and detect the same test code from a similarly-functioning testing arrangement at the far end of the digital channel. Failure of a comparison between sent and received codes results in the inhibition of a positive D. C. path check indication to the common controller.

REFERENCES:
patent: R27798 (1973-10-01), Laane
patent: 3652803 (1972-03-01), Joel
patent: 3683115 (1972-08-01), Schellenberg
patent: 3823269 (1974-07-01), Saito

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