Hook-flash simulation in parallel with off-hook devices

Details Hook-flash simulation in parallel with off-hook devices Hook-flash simulation in parallel with off-hook devices

2005-09-20

2005-09-20

Kuntz, Curtis (Department: 2643)

Telephonic communications

Substation or terminal circuitry

Hold circuit

C379S207060

Reexamination Certificate

active

06947546

ABSTRACT:
A method for producing a hook-flash event on a loop (6B) incorporating a supervisory signal circuit. The supervisory signal circuit includes a supervisory signal source (2) that causes a supervisory current to flow around the loop through a threshhold detector device (4) and one or more supervised devices (10and24). When a counter-signal source (34) is connected to the loop, it opposes the flow of loop supervisory loop current (12), causing its level to drop below the detection threshhold of the threshhold detector device. After a timed period, the counter-signal source is disconnected from the loop, allowing the level of supervisory loop current to return to its normal state, thereby completing the hook-flash event on the loop.

REFERENCES:
patent: 4251693 (1981-02-01), Christiansen
patent: 4351986 (1982-09-01), Fechalos
patent: 4387274 (1983-06-01), Stein
patent: 4613730 (1986-09-01), Fechalos
patent: 4926461 (1990-05-01), Kuok
patent: 6345088 (2002-02-01), Gu et al.

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