Stored program controlled digital public exchange

Details Stored program controlled digital public exchange Stored program controlled digital public exchange

1995-08-29

1996-10-22

Zele, Krista M.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

379269, 379242, 379196, H04M 300

Patent

active

055685439

ABSTRACT:
A stored-program-controlled local telephone exchange in which internal connections and conference connections are treated as though they were both a combination of an external connection, namely an originating connection and a terminating connection. This is achieved by providing a virtual route, which is realized by records in a computer memory and which is linked to a call handler and which, from the aspect of the call handler, behaves as a conventional trunk terminal. Alternatively, the virtual route can be replaced with two hardware implemented digital trunk terminals which are mutually connected by a physical wire connection. In the case of a conference connection, the conference equipment is connected to a hardware implemented digital trunk terminal which coacts with the virtual route. From the aspect of the call handlers, there is formed a barrier over which signalling takes place in an identical manner irrespective of whether the call concerned is an external call, an internal call or a conference call. A group selector incorporated in the local telephone exchange is influenced by program logic located behind the information barrier, without the call handlers being aware of the existence of the group selector.

REFERENCES:
patent: 3886315 (1975-05-01), Lee et al.
patent: 4201889 (1980-05-01), Lawrence et al.
patent: 4317962 (1982-03-01), Cox et al.
patent: 4336422 (1982-06-01), Mellon
patent: 4419753 (1983-12-01), Kojima et al.
patent: 4694452 (1987-09-01), Beckinger et al.
patent: 4791662 (1988-12-01), Ahnen et al.
patent: 4928304 (1990-05-01), Sakai

Affiliated with

Also associated with

Rating

Stored program controlled digital public 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 Stored program controlled digital public exchange, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stored program controlled digital public exchange will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2365674