Subscriber's line closing circuit

Details Subscriber's line closing circuit Subscriber's line closing circuit

1987-03-12

1988-04-12

Ng, Jin F.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379379, 379382, H04M 322

Patent

active

047379863

ABSTRACT:
A subscriber's line closing circuit, in which at least one first photo coupler and at least one second photo coupler connected in parallel but in reverse polarities are inserted in a closing loop so as to detect an incoming call, to form a DC Loop and to sense the direction of a direct current flowing through the closing loop.

REFERENCES:
patent: 4326104 (1982-04-01), Bergida
patent: 4495494 (1985-01-01), McCune
"Control Circuit for Applying Ringing Voltage to Distinct Line Circuits", S. D. Samuels, Western Electric Technical Digest, No. 65, Jan. 1982, pp. 23-24.
"Telephone on/off Hook Detector", C. B. Glowienku et al., IBM Technical Disclosure Bulletin, vol. 16, No. 5, Oct. 1973, pp. 1558-1559.

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