Multiplex communications – Wide area network – Packet switching
Patent
1983-12-06
1985-06-18
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 58, H04Q 1100, H04Q 1104
Patent
active
045244405
ABSTRACT:
A fast circuit switching system that establishes a circuit for each packet-sized data communication. Information is conveyed from a number of communications modules in source channels to a number of port controllers and to a network. Information is conveyed from the network to destination channels. Each communications module includes a transmitter that transmits in an associated source channel, circuit setup request signals defining destination channels and also transmits data. Each port controller stores one of a number of status words defining the availability of the destination channels and each of these status words is cycled to each port controller. A port controller responds to one of the circuit setup request signals and to subsequent data, when one of the status words cycled thereto defines as available, a destination channel defined by the circuit setup request signal, by transmitting the circuit setup request signal and the subsequent data to the network. The network responds to circuit setup request signals received from the port controllers by transmitting data received from the port controllers to the destination channels defined by those circuit setup request signals.
REFERENCES:
patent: 4005272 (1977-01-01), Collins et al.
patent: 4038497 (1977-07-01), Collins et al.
patent: 4201889 (1980-05-01), Lawrence et al.
patent: 4201890 (1980-05-01), Lawrence et al.
patent: 4201891 (1980-05-01), Lawrence et al.
patent: 4392221 (1983-07-01), Hesketh
"A Review of Classification Schemes for Computer Communication Networks", by William Greene, Computer, Nov. 1977, reprinted in Tutorial: Distributed Processor Communication Architecture, by Kenneth J. Thurber, pp. 135-144.
"Performance Evaluation of a Distributed Burst-Switched Communications System", by James D. Morse and Stanley J. Kopec, Jr., Conference Proceedings, Phoenix Conference on Computers and Communications, Mar. 1983, pp. 41-46.
AT&T Bell Laboratories
Olms Douglas W.
Padden Frederick W.
Rokoff Kenneth I.
Watland Ross T.
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