Multiplex communications – Wide area network – Packet switching
Patent
1982-12-10
1984-10-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 29, 370100, 375 36, 375106, H04J 302
Patent
active
044751915
ABSTRACT:
High density time division busses suffer from many problems, one of which is that impedance discontinuities cause signal reflections to occur along the bus. These reflections, in turn, affect the settling time and noise margins of the bus and thus reduce the time "window" in which valid signals may be received. There is disclosed a transmission bus structure which allows for bidirectional, multi-port operation by using current drivers instead of the traditional voltage drivers for placing data signals on the bus. The transmission bus is designed in a manner which allows transmission and reception from a single clock on the same clock edge thereby substantially increasing the time allowed for transmission response and also simplifying the clock distribution requirements.
REFERENCES:
patent: 3751591 (1973-08-01), Radcliffe et al.
patent: 3835252 (1974-09-01), Ananiades et al.
patent: 4225752 (1980-09-01), Looschen
patent: 4373183 (1983-02-01), Means et al.
"MECL System Design Handbook," May 1982, Bussing With MECL 10,000 Integrated Circuits, pp. 210-215.
"Motorola MECL Data Book," 1982, pp. 3-172-3-177.
James Dennis B.
Moffitt Bryan S.
Smith Douglas C.
AT&T Bell Laboratories
Olms Douglas W.
Tannenbaum David H.
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