Method and apparatus for detecting transmission system failures

Details Method and apparatus for detecting transmission system failures Method and apparatus for detecting transmission system failures

1980-01-23

1981-04-07

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

370 13, H04B 346

Patent

active

042608597

ABSTRACT:
The failure of an interoffice carrier transmission system is detected by monitoring the signaling irregularities on the trunks served by the system. When at least two trunks fail to return a "start-dial" signal from the terminating office, all trunks are removed from service. The trunks are periodically tested to ascertain when the carrier system has been restored. The trunks are tested less frequently for prolonged carrier failures and at least two trunks, including the last trunk to fail, must pass the test before the carrier system is considered restored to service.

REFERENCES:
patent: 3344241 (1967-09-01), Harmon et al.
patent: 3809818 (1974-05-01), Johnston
patent: 4066843 (1978-01-01), Waks et al.

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