Digital communications transmission system

Details Digital communications transmission system Digital communications transmission system

1979-02-22

1980-11-25

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

H04L 514

Patent

active

042362440

ABSTRACT:
A digital communications transmission system includes calling and called digital terminals which are interconnected with a two-wire line or a four-wire line by way of respective termination sets. Each terminal includes a transmitter, a receiver and a calling device. The transmission system is particularly characterized in that there is provided in the calling terminal a transmitter which transmits signals in a first frequency position and a receiver which receives signals in a second frequency position, while the called terminal includes a transmitter which transmits signals in the second frequency position and a receiver which receives signals in the first frequency position.

REFERENCES:
patent: 3655915 (1972-04-01), Liberman et al.
patent: 3936602 (1976-02-01), Korver
patent: 3937882 (1976-02-01), Bingham
patent: 3993867 (1976-11-01), Blood, Jr.
patent: 4041398 (1977-08-01), Ellis

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