Subscriber line circuit having an improved offhook supervision c

Details Subscriber line circuit having an improved offhook supervision c Subscriber line circuit having an improved offhook supervision c

1985-08-29

1987-06-16

Rubinson, Gene Z.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379350, H04M 322

Patent

active

046741178

ABSTRACT:
An improved offhook supervision circuit including an amplifier connected to a subscriber loop through the tip and ring conductors of a subscriber line circuit. The amplifier is arranged to develop and output a loop voltage signal representing the level of the DC signals applied to the subscriber loop circuit. A comparator device has a first input connected to the amplifier and is arranged to receive the loop voltage signal output by the amplifier. A second input of the comparator device is connected to a reference voltage device which outputs a predetermined reference signal voltage. Any significant reduction of the DC signal level on the loop circuit will cause the loop signal voltage output by the amplifier to fall below the reference signal voltage. An offhook signal is then output from the comparator device to a control device signaling an offhook condition.

REFERENCES:
patent: 4281219 (1981-07-01), Cowpland et al.
patent: 4317964 (1982-03-01), Biggs et al.
patent: 4326104 (1982-04-01), Bergida
patent: 4525603 (1985-06-01), Bond
patent: 4540853 (1985-09-01), Albouy
patent: 4540854 (1985-09-01), Beirne

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