Multiplex communications – Wide area network – Packet switching
Patent
1983-09-12
1985-09-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 116, H04J 314
Patent
active
045436517
ABSTRACT:
A duplicated switching system including a number of communication units wherein each digital word transmitted by an originating communication unit is conveyed via both of the duplicate time-multiplexed switches in the system and a destination communication unit autonomously selects the digital words to be used for further communication based upon whether the word error check portions can be derived from the word information portions. Advantageously, the system continues to operate in the presence of system faults not simultaneously affecting digital words from both time-multiplexed switches without any erroneous words being used for further communication and without involving a system central control.
REFERENCES:
patent: 3974340 (1976-08-01), Ghisler
patent: 4197523 (1980-04-01), Philip et al.
patent: 4213201 (1980-07-01), Gagnier et al.
patent: 4228535 (1980-10-01), Workman et al.
patent: 4254498 (1981-03-01), Tawara et al.
patent: 4345324 (1982-08-01), Smitt
patent: 4382294 (1983-05-01), Beuscher et al.
patent: 4413335 (1983-11-01), Clements et al.
J. N. A. Risbridger, The Post Office Electrical Engineer, "System X: Subsystems--Part 1--The Digital Switching Subsystem", vol. 73, Apr. 1980, pp. 19-26.
AT&T Bell Laboratories
Olms Douglas W.
Rokoff Kenneth I.
Samples Kenneth H.
Watland Ross T.
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