Ring detector

Details Ring detector Ring detector

1987-02-13

1989-02-14

Ng, Jin F.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379377, 379230, H04M 322

Patent

active

048052132

ABSTRACT:
A device for detecting a specified signal on a conventional telephone line includes a pair of input terminals to which to connect a pair of conventional telephone lines, and a circuit connected to the input terminals that draws a different amount of power from a separate power source when the specified signal is present across the input terminals thant it draws otherwise. A transformer couples the power supply to the circuit while isolating the power source from the input terminals, and power sensing circuitry that senses a difference in power supplied to the transformer generates a control signal that is also isolated from the input terminals.

REFERENCES:
patent: 4056689 (1977-11-01), Freimanis
patent: 4119806 (1978-10-01), Baratin
patent: 4429186 (1984-01-01), Gartner
patent: 4458112 (1984-07-01), Svala

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