Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate
2005-12-20
2005-12-20
Kuntz, Curtis (Department: 2643)
Telephonic communications
Subscriber line or transmission line interface
Protective circuit
C379S402000
Reexamination Certificate
active
06978013
ABSTRACT:
A device for the DC-decoupled connection of a telephone line to a signal processing device at the subscriber end of the telephone line is disclosed. The device exhibits a first circuit which is connected to the telephone line, a second circuit which is connected to the signal processing device, and a transformer which exhibits a first and a second winding, the first winding being connected to the first circuit and the second winding being connected to the second circuit and the first and second winding being DC-decoupled from one another. The device is characterized by the fact that the first circuit exhibits a hybrid circuit for separating the signals of the telephone line into a first signal path which extends from the telephone line to the signal processing device, and into a second signal path which extends from the signal processing device to the telephone line.
REFERENCES:
patent: 4679115 (1987-07-01), Connan et al.
patent: 5870046 (1999-02-01), Scott et al.
patent: 0 622 899 (1994-11-01), None
patent: 0 576 882 (1997-04-01), None
Infineon - Technologies AG
Jamal Alexander
Kuntz Curtis
Welsh & Katz Ltd.
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