Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1991-05-21
1992-06-02
Schreyer, Stafford D.
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379383, 379386, 379418, 379442, H04M 154, H04M 164, H04M 172, H04M 902
Patent
active
051194180
ABSTRACT:
In a telephone system, several telephone terminals are connected to a single telephone line including several telephone interface circuits (6, 7, 8), each interface circuit being energized by ringing signals appearing on the line and being arranged between the telephone line (3) and one of the telephone terminals (13, 14, 15, 16), the ring of which is disconnected from the line. Each interface circuit comprises a circuit (26) for counting ringing signals and picking up the line, this first circuit receiving at the input the ringing signals appearing on the line (L1-L2) during a telephone call, and counting a predetermined number of these ringing signals, then picking up the line by a relay (27) at the moment the last ringing signal counted stops. The system is powered only by the signals on the telephone line.
REFERENCES:
patent: 3688038 (1972-08-01), Hugyecz et al.
patent: 4367376 (1983-01-01), Proctor et al.
patent: 4415774 (1983-11-01), Driver
patent: 4653089 (1987-03-01), Eydelman
patent: 4975940 (1990-12-01), Hashimoto
J. Fitzpatrick, "E.R.--An Electronic Telephone Receptionist," Speech Technology, Feb./Mar. 1985, pp. 105-107.
Dolphin Integration
Schreyer Stafford D.
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