Detection of ground or loop start configuration in telephone loo

Details Detection of ground or loop start configuration in telephone loo Detection of ground or loop start configuration in telephone loo

1984-04-16

1986-11-11

Brown, Thomas W.

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379338, 379229, H04M 322, H04M 714, H04M 1902

Patent

active

046224394

ABSTRACT:
A telephone loop signalling circuit, which automatically replicates either a loop start or a ground start configuration under virtually all operating conditions of the telephone line including those which have heavily induced power line voltages. The circuit utilizes a bias network connected to the central office side of the line together with a plurality of detectors which coact with logic circuitry to differentiate between the two configurations under these widely varying conditions.

REFERENCES:
patent: 3936614 (1976-02-01), Suntop
patent: 4002850 (1977-01-01), Richards et al.
patent: 4079208 (1978-03-01), Rogers et al.
patent: 4190745 (1980-02-01), Jusinskas, Jr. et al.
patent: 4221936 (1980-09-01), Vaughan
patent: 4310725 (1982-01-01), Mehaffey
patent: 4310728 (1982-01-01), Dumont
patent: 4320258 (1982-03-01), McDonald
patent: 4385336 (1983-05-01), Takeshita et al.
patent: 4535201 (1985-08-01), Kasbia et al.

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