Apparatus for selecting terminal equipment in telephone lines

Details Apparatus for selecting terminal equipment in telephone lines Apparatus for selecting terminal equipment in telephone lines

1979-10-17

1982-12-28

Konick, Bernard

179 84R, H04M 1106

Patent

active

043663478

ABSTRACT:
An exchange center is connected to telephone lines and a telephone and a data transmitter as terminal equipment are connected to the telephone lines. The data transmitter is actuated depending upon the polarity of DC voltage applied to the telephone lines. The telephone line is potentially opened by detecting the current of the telephone during the operation of the data transmitter. The impedance of the telephone line during the opening state is detected whereby the operation of the data transmitter is stopped by inverting the DC voltage applied to the telephone line and the telephone is predominantly communicated through the exchange center over the data transmitter.

REFERENCES:
patent: 3414676 (1968-12-01), Long
patent: 3941939 (1976-03-01), Holmes et al.
patent: 4022977 (1977-05-01), Nomura
"Days of Decision are Here for Utility Remote Meter Reading", by Richard Martin, Pipeline and Gas Journal, Apr. 1972, pp. 23-28.

Affiliated with

Also associated with

Rating

Apparatus for selecting terminal equipment in telephone lines does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for selecting terminal equipment in telephone lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for selecting terminal equipment in telephone lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1338472