Time-division multiplex digital transmission system with interme

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179 15BS, H04J 308

Patent

active

041058690

ABSTRACT:
Time-division multiplex digital transmission system comprising two terminal stations and at least one intermediate station connected to one another by first and second multi-channel multiplex lines respectively corresponding to both data transmission directions, each digital channel of each multiplex line being allocated to a recurrent time-slot of a frame. Each intermediate station comprises means for transiting digital channels allocated to corresponding time-slots of multiplex lines and for extracting from one of multiplex lines to local lines of the intermediate station and for inserting from the local lines to other multiplex line digital channels allocated to corresponding time-slots according to the two transmission directions, and inversely. Each intermediate station comprises also one channel multiplexer and demultiplexer. The demultiplexer is adapted to extract and to transmit digital channels from the first or second multiplex line to given local lines respectively, when the multiplexer simultaneously inserts and transmits local channels from the given local lines to the second or first multiplex line, respectively.

REFERENCES:
patent: 2740838 (1956-04-01), Pierce
patent: 3040130 (1962-06-01), Hughes
patent: 3987250 (1976-10-01), Barbier et al.
patent: 4002846 (1977-01-01), Barbier

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