Conference trunk circuit for an exchange

Details Conference trunk circuit for an exchange Conference trunk circuit for an exchange

1977-01-17

1977-09-06

Brown, Thomas W.

179 18AH, H04M 356

Patent

active

040469662

ABSTRACT:
There are disclosed first and second groups of internal office trunks used for an exchange. Each internal office trunk comprises first and second terminals for connecting two subscribers' telephones through a switching matrix circuit according to a demand signal from a central controller. The internal office trunks of the second group respectively further comprise a third terminal. The third terminal is connected to a switching circuit controlled by the central controller. The switching circuit controls a mutual connection of the internal office trunk circuits. As a result of being connected to the third terminal mutually by the switching circuit, the second group of the internal office trunks operates as a conference trunk.

REFERENCES:
patent: 3497631 (1970-02-01), Pearce et al.
patent: 3515807 (1970-06-01), Clark
patent: 3903373 (1975-09-01), Gueldenpfennig et al.

Affiliated with

Also associated with

Rating

Conference trunk circuit for an exchange does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Conference trunk circuit for an exchange, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Conference trunk circuit for an exchange will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2163827