Gte Laboratories Incorporated

Donald J Gray

Michael Cooperman

Richard W Sieber

Rob Moolenbeek

Lalit Patel

Arnold H Bearak

Shou-I Wang

A digital switching system is described for providing time division multiplexed digital communication of parallel sequential signals of N words each of M bit length between N telephone data subscribers over N transmission lines in which an array of orthogonal RAM memory devices provide parallel-to-serial conversion and multiplexing of the N words each of M bit length to provide a time division multiplexed serial digital bit stream of M words, each N bits in length, which are transmitted over a transmission line to a serial-to-parallel converter and coupled to a second orthogonal RAM memory device in which the N words M bits in length from the serial-to-parallel converter are stored and coupled to N telephone data subscribers over the transmission lines.

Digital switching system with two-directional addressing rams

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.

Digital switching system

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Lynnfield, MA, United States of America

Donald J Gray