Multiplex communications – Wide area network – Packet switching
Patent
1984-12-28
1987-01-20
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 32, H04B 156
Patent
active
046384731
ABSTRACT:
A two-wire bidirectional transmission system for transmitting electrical signals simultaneously in opposite directions between terminals over a pair of wires wherein the transmitter at one terminal transmits a voltage signal over one of said wires while the transmitter at the second terminal generates a voltage signal over the same wire, the second wire being grounded at each end. Impedance matching resistors, that is resistors matched to the impedance of the two wires, are coupled between each of the transmitters and the wire upon which the voltage signal is generated. A subtractor circuit is provided at each of the terminals for linearly subtracting a signal proportional to one-half of the voltage transmitted and thereby receiving at each terminal a voltage signal equal to one-half of the voltage transmitted by the opposite terminal.
REFERENCES:
patent: 3730993 (1973-05-01), Moriyasu
patent: 4117277 (1978-09-01), van den Elzen et al.
patent: 4162371 (1979-07-01), Belforte
patent: 4237463 (1978-10-01), Bjor et al.
patent: 4393494 (1980-12-01), Belforte et al.
"Full-Duplex Communication Over a Single Wire", Charles Green, Digital Design, 5/82.
Cooperman Michael
Sieber Richard W.
Griffin Robert L.
GTE Laboratories Incorporated
Huseman M.
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