Automatic circuit back-up system

Details Automatic circuit back-up system Automatic circuit back-up system

1993-04-27

1996-05-07

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 32, 379 22, 379 12, 379221, 370 13, 370 16, H04M 124, H04M 308, H04M 322, H04M 700

Patent

active

055154182

ABSTRACT:
An automatic circuit back-up system is adapted to a data communication system including a private communication line for data communication and a back-up communication circuit for providing a back-up for the private communication circuit. The automatic circuit back-up system includes a periodic message transmitting circuit for transmitting a periodic message at a predetermined regular period to a distant office through the back-up communication circuit, and a monitoring circuit for monitoring whether the periodic message transmitted from the distant office via the back-up communication circuit is received at the predetermined regular period.

REFERENCES:
patent: 4071700 (1978-01-01), Huffman et al.
patent: 5138609 (1992-08-01), Hashimoto
patent: 5146474 (1992-09-01), Nagler et al.
patent: 5193086 (1993-03-01), Satomi et al.
patent: 5210740 (1993-05-01), Anzai et al.

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