Multiplex communications – Wide area network – Packet switching
Patent
1984-04-23
1986-09-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
340521, H04J 1500
Patent
active
046100121
ABSTRACT:
A signal transmission system for transmitting a first signal and a second signal superposed thereupon through a common signal transmission line composed of two wires. A plurality of terminal units are connected through the common signal transmission line to a central unit and are connected in parallel with each other across the two wires of the signal transmission line. At least one of the terminal units transmits the first signal in the form of a level signal; and at least one of the terminal units transmits or receive the second signal in the form of a superposed signal on the level signal. The central unit transmits and receives the superposed signal as well as receives the level signal for receiving data or information respectively from the above terminal units. Accordingly, both the first and second signals of different types and therefore carrying different information can be transmitted between the central unit and the respective terminal units through the common signal transmission line.
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patent: 3612770 (1971-10-01), Zegers
patent: 3732374 (1973-05-01), Rocher et al.
patent: 3870828 (1975-03-01), Saliga
patent: 3943284 (1976-03-01), Nelson
patent: 4206449 (1980-06-01), Galvin et al.
patent: 4385287 (1983-05-01), Eatwell
Murakami Kazumasa
Terada Motoharu
Matsushita Electric & Works Ltd.
Olms Douglas W.
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