Telephone circuit assembly

Details Telephone circuit assembly Telephone circuit assembly

1992-05-29

1995-03-28

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

379373, 379252, 379253, 379254, H04M 1900

Patent

active

054024846

ABSTRACT:
A circuit assembly which includes an interface circuit between a subscriber line and exchange devices of the kind with two amplifiers connected in a bridge configuration between the battery terminals and having a means of detecting the output currents; a supply circuit which includes the exchange battery and a ring generator; a switch-over means for putting the line through the interface circuit or the supply circuit; two bridge resistors which are in series with the line when the latter is connected to the supply circuit and of which one is connected permanently between one of the line terminals and the output of one of the amplifiers, which output is substantially at the potential of one of the battery poles; an additional resistor, having a much higher resistive value than that of the bridge resistors and being connected between the other of the line terminals and the output of the other of the amplifiers; and a processing means within the interface circuit, which includes said detecting means and is effective to isolate the useful signal from the line current, recognize a possible hook-off state, and send a corresponding signal to the exchange devices.

REFERENCES:
patent: 4022980 (1977-05-01), Kitajewski et al.
patent: 4396805 (1983-08-01), Wagner
patent: 4524245 (1985-06-01), Littlefield
patent: 4852162 (1989-07-01), Taya et al.
patent: 4866768 (1989-09-01), Sinberg
patent: 4995111 (1991-02-01), Tojo et al.
patent: 5005199 (1991-04-01), Dupillier
patent: 5133006 (1992-07-01), Khvat
patent: 5247573 (1993-09-01), Reichelt
patent: 5293420 (1994-03-01), Nagato

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