Device for detecting telephone line seizure

Details Device for detecting telephone line seizure Device for detecting telephone line seizure

2005-04-05

2005-04-05

Isen, Forester W. (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S379000

Reexamination Certificate

active

06876741

ABSTRACT:
The device for detecting telephone line seizure performs a measurement of voltage of the telephone line across a first and a second optocoupler connected in series to the telephone line and arranged head-to-tail. The first optocoupler makes it possible to discharge a capacitor connected to the telephone line, the second optocoupler converts the discharge current into an image current in a measurement circuit. This device comprises means ensuring negative feedback of the second optocoupler to the first optocoupler. With this layout, the influence of the transfer coefficients of the optocouplers on the voltage measurement is decreased, so as to increase the accuracy of measurement.

REFERENCES:
patent: 5291545 (1994-03-01), Stahl
patent: 6134321 (2000-10-01), Pitsch
patent: 6393123 (2002-05-01), Staver et al.
patent: 6470083 (2002-10-01), Hemminger et al.
patent: 37 12324 (1988-08-01), None

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