Telephone line control system

Details Telephone line control system Telephone line control system

1974-11-11

1976-03-09

Olms, Douglas W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3401461C, 340163, H04B 346

Patent

active

039433056

ABSTRACT:
Telephone line testing equipment in which a series of alternating current tone pulses are transmitted from the central office along the lines to a sensing means placed at a remote point in the circuit. The sensing means receives the coded tone pulse sequence, decodes it to determine if the address is correct, and if so, what information is present, and then either connects or disconnects the remote equipment from the line or, in the alternative, connects suitable loopback testing circuits to the line.

REFERENCES:
patent: 3159812 (1964-12-01), Engel
patent: 3371165 (1968-02-01), Earle et al.
patent: 3384873 (1968-05-01), Sharma
patent: 3790723 (1974-02-01), Stewart
patent: 3814839 (1974-06-01), Lubarsky et al.
patent: 3843848 (1974-10-01), Cox
U.S. Published Patent Application, B 411,633, Bonser et al., 1-28-75.

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