Method and an arrangement for generating a ringing signal

Details Method and an arrangement for generating a ringing signal Method and an arrangement for generating a ringing signal

1995-01-20

1996-09-03

Hofsass, Jeffery

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379401, H04M 300, H04M 900

Patent

active

055531326

ABSTRACT:
To generate a ringing signal by means of a subscriber line interface circuit having two final stages, each for supplying an individual subscriber line wire, one of the subscriber line wires is connected to one of the input terminals of an operational amplifier, the other input terminal of which being connected to the interconnecting point between two series connected resistors having the same resistance. The output terminal of the operational amplifier is connected, via a first resistor, to a current input terminal of the subscriber line interface circuit for generating a first current. A signal generator, via a second resistor, is also connected to said current input terminal for generating a second current. The final stages of the subscriber line interface circuit are supplied with current from current input terminal to drive the final stages to generate the ringing signal.

REFERENCES:
patent: 3689700 (1972-09-01), Lent
patent: 3723662 (1973-03-01), Macrander
patent: 4152670 (1979-05-01), Rimondini et al.
patent: 4370526 (1983-01-01), Schoofs et al.
patent: 4961222 (1990-10-01), Johansson et al.
PBL 3764, Ericsson, "Subscriber Line Interface Circuit", May 1993.
PBL 3765, Ericsson, "Subscriber Line Interface Circuit", Jan. 1989.
PBL 3766, Ericsson, "Subscriber Line Interface Circuit", May 1993.
HC 5513, Harris Semiconductor, "Subscriber Line Interface Circuit", Nov. 1995.

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