Duplex transmission mechanism for digital telephones

Details Duplex transmission mechanism for digital telephones Duplex transmission mechanism for digital telephones

1984-04-03

1986-07-01

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 24, 370 28, 179170NC, 179170D, H04B 156, H04B 152, H04J 1500, H04L 514

Patent

active

045983968

ABSTRACT:
A duplex digital transmitter system is disclosed which permits simultaneous digital signal exchange over a two-wire loop. Two sets are provided at the ends of the loop, each having a three-port lattice adapted to separate the transmitted and received digital signals. The digital signals are encoded using a biphase scheme so that they have a zero D.C. component. Therefore the loop is used simultaneously to transmit D.C. power from one set to the other.

REFERENCES:
patent: 3172959 (1965-03-01), Burns et al.
patent: 3936602 (1976-02-01), Korver
patent: 3987253 (1976-10-01), Pipitone
patent: 4163878 (1979-08-01), Hashemi
patent: 4197431 (1980-04-01), Vis
A. Lautier et al, "Full Duplex Line Driver", Oct. 1972, vol. 15, No. 5, IBM Tech. Disc. Bull., p. 1647.

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