Multiplex communications – Wide area network – Packet switching
Patent
1982-08-30
1984-11-27
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 62, H04J 300
Patent
active
044854692
ABSTRACT:
A programmed controlled signal processor operating as a time slot interchanger and having improved conferencing facilities is disclosed. A conference accumulator RAM is used that has a memory location unique to each conference call served by the system. A unique RAM location is assigned to the serving of each conference call in order to facilitate the generation of the required sum and difference signals. The use of an individual accumulator RAM position for this purpose permits the use of a simpler instruction set for the signal processor. This simpler instruction set permits a plurality of instructions for the serving of a given conference call to be interspersed with instructions for other calls rather than be contiguous to one another.
REFERENCES:
patent: 4112258 (1978-09-01), Alles
patent: 4377859 (1983-03-01), Dunning et al.
"An Experimental Digital Switch for Data and Voice"; Session 21B, Paper 3, International Switching Symposium; Sep. 1981; pp. 1-7.
"An Experimental User-Resident Communications Controller Supporting Sub-rate Circuit Switched Service"; International Symposium on Subscriber Loops and Services; 1980; pp. 68-71.
"An Overview of a Flexible Digital Switching System"; Communication Techniques Seminar; Mar. 1979; pp. 2-1 to 2-5.
AT&T Bell Laboratories
Duft Donald M.
Griffin Robert L.
Scutch III Frank M.
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