Circuit and method for stimulation of a telephone apparatus

Details Circuit and method for stimulation of a telephone apparatus Circuit and method for stimulation of a telephone apparatus

2007-01-23

2007-01-23

Swerdlow, Daniel (Department: 2615)

Telephonic communications

Subscriber line or transmission line interface

C379S413020

Reexamination Certificate

active

09700272

ABSTRACT:
An electric device (202, 301) for connecting an analogue data transfer device (202) by means of a control unit (203) to a digital transfer system comprises means for connecting to a data transfer device via a twin cable (204). In addition, it comprises a current amplifier arrangement (214, 314, 340) for feeding a certain current to the twin cable, a first current switching device (219) for switching a first control current to the current amplifier arrangement, and a second current switching device (220) for switching a second control current to the current amplifier arrangement. The current switching devices (219, 220) are preferably current mirrors.

REFERENCES:
patent: 4458112 (1984-07-01), Svala
patent: 5125027 (1992-06-01), Blaszykowski et al.
patent: 5402485 (1995-03-01), Takato et al.
patent: 5515434 (1996-05-01), Cotreau
patent: 5659570 (1997-08-01), Cotreau et al.
patent: 2132448 (1984-07-01), None

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