Telephone system with controllable ringing voltage

Details Telephone system with controllable ringing voltage Telephone system with controllable ringing voltage

2006-05-16

2006-05-16

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S418000, C379S252000

Reexamination Certificate

active

07046797

ABSTRACT:
A telephone system includes a controllable ringing generator for generating a ringing signal and an interface for providing a ringing voltage derived from that signal on the transmission line. The controllable ringing generator includes a control device for controlling the ringing voltage in response to the ringing current.

REFERENCES:
patent: 5600713 (1997-02-01), Chen
patent: 5926544 (1999-07-01), Zhou
patent: 6813340 (2004-11-01), Issaa et al.
patent: 2001/0006549 (2001-07-01), Harasaki et al.
patent: 3926149 (1990-02-01), None
patent: DE 0829998 (1998-03-01), None
patent: DE 1017220 (2000-07-01), None
patent: DE 1093286 (2001-04-01), None
patent: WO 99/26348 (1999-05-01), None
patent: WO 99/27703 (1999-06-01), None

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