Supply circuit for supplying a two-wire line

Details Supply circuit for supplying a two-wire line Supply circuit for supplying a two-wire line

2005-12-05

2010-12-14

Jamal, Alexander (Department: 2614)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S398000

Reexamination Certificate

active

07853008

ABSTRACT:
A supply circuit for supplying a two-wire line comprises a first resistor connected between a first supply voltage potential and a first two-wire line connection of a two-wire line, a current-limiting device connected between a second two-wire line connection of the two-wire line and a second supply voltage potential and providing the two-wire line with a limited current on the basis of a variable setting potential, and an impedance-matching device connected between the second two-wire line connection and the second supply voltage potential and providing the variable setting potential on the basis of a reference potential and a voltage across the current-limiting device. The first resistor has a first impedance and the impedance-matching device and the current-limiting device form a second impedance being present at the second two-wire connection. The first and second impedances are essentially the same.

REFERENCES:
patent: 4317963 (1982-03-01), Chea, Jr.
patent: 6647114 (2003-11-01), Sacca
patent: 7260214 (2007-08-01), Enriquez et al.
patent: 0884859 (1998-12-01), None
German Office Action dated Sep. 29, 2005.

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