Apparatus for combining a central telephone trunk line with a cu

Details Apparatus for combining a central telephone trunk line with a cu Apparatus for combining a central telephone trunk line with a cu

1974-08-05

1976-02-24

Brown, Thomas W.

H04M 714

Patent

active

039405702

ABSTRACT:
A system for combining a central telephone trunk line with the trunk line of a customer exchange wherein said central telephone exchange is provided with means for separating the dial, talk, and ring functions into a first partial circuit for providing a service signal to and from said customer trunk line, and a second partial circuit for providing a ring signal to said customer trunk line, an interface device comprising a first circuit controlling the power feed, ring trip and dial pulse of said customer exchange and a second circuit controlling the ring signal from said telephone exchange. The first circuit of said interface system includes a first relay activated by said customer trunk line having a contact located in said first partial circuit responsive to said activation for closing said first partial circuit to establish service with said telephone exchange trunk line. The first relay has at least two windings and a single core, said relay being operable by a current through either of said windings, one of said windings being connected between a DC battery source of power and one lead of said customer trunk line, the other of said windings being connected between ground and the other lead of said customer trunk line, said relay being operable on looping of the leads of said customer trunk line and on grounding of said one of said leads. A second relay located in said second partial circuit is activated by a ring pulse in said telephone exchange trunk line, said second circuit of said interface system including a contact movable by said second relay to connect said customer trunk line to an AC source of ringing current.

REFERENCES:
patent: 3156775 (1964-11-01), Ioakimidis et al.
patent: 3221108 (1965-11-01), Seemann et al.
patent: 3715513 (1973-02-01), Miller

Affiliated with

Also associated with

Rating

Apparatus for combining a central telephone trunk line with a cu 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 combining a central telephone trunk line with a cu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for combining a central telephone trunk line with a cu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2080583