Telephone line interface circuit with voltage switching

Details Telephone line interface circuit with voltage switching Telephone line interface circuit with voltage switching

H - Electricity

04

M

H04M 19/00 (2006.01) H04M 19/02 (2006.01)

Patent

CA 2105376

A two-wire telephone line interface circuit comprises a driver circuit (10) for supplying direct current on the line (13), a controlled voltage generator (14), a sensing circuit (12) for monitoring the line current, a control circuit (15) for controlling an out- put voltage (CV) or the voltage generator, and a switching circuit (11). The control circuit controls the switching circuit to supply, as a supply voltage (DV) for the driver circuit, a battery voltage (BV) in an on-hook state of the line or the controlled output vol- tage of the voltage generator in an off-hook state of the line, this output voltage being controlled to provide off-hook current limit- ing. The control circuit also controls the switching circuit to selectively supply the controlled output voltage of the voltage genera- tor as a signaling voltage to at least one wire (TV, RV) of the line for high voltage signalling, e.g. ringing, on the line. Desirable forms of the switching circuit are described.

Affiliated with

Also associated with

Rating

Telephone line interface circuit with voltage switching does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telephone line interface circuit with voltage switching, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone line interface circuit with voltage switching will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1493487