Digital switching system

Details Digital switching system Digital switching system

1986-07-03

1987-04-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 58, 370 66, 370 61, 370112, H04Q 1104, H04J 304

Patent

active

046566210

ABSTRACT:
A digital switching system for switching messages between a plurality of subscribers located a relatively short distance from the switching system. The message format for the system comprises the serial transmission of messages of M bits of information which are transmitted from the switching system to the subscribers during one-half of a transmission frame and messages of M bits of information which are transmitted from the subscribers to the switching system during the other half of the transmission format. Addressable memory arrays are employed at the switching system for multiplexing and serial-to-parallel conversion and switching. In a preferred embodiment up to 40 telephone and/or data terminal messages are handled in 125 microsecond time frames with 8 bit voice and 8 bit data words plus a start and stop bit and 1 signalling bit message format from each of the subscribers.

REFERENCES:
patent: 3084222 (1963-04-01), Foot et al.
patent: 3105874 (1963-10-01), Fisher, Jr.
patent: 3105875 (1963-10-01), David
patent: 4027301 (1977-05-01), Mayer
patent: 4071711 (1978-01-01), Beaupre et al.
patent: 4430734 (1984-02-01), Hubbard
patent: 4432087 (1984-02-01), Hubbard

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