Multiplex communications – Wide area network – Packet switching
Patent
1984-02-14
1986-12-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
371 8, 455179, H04J 116, G06F 1100, H04B 1116
Patent
active
046270450
ABSTRACT:
A redundant common communication system for a distributed process control or data processing system has multiple stations which are coupled to at least two redundant communication channels (such as communication busses). Each station includes a transmitter for transmitting data packets and a receiver for receiving data packets. Each data packet includes a channel selection field which identifies a selected channel to be used by all station during a succeeding transmission of a data packet. Each station makes an assessment of quality of each channel based upon the occurrence of errors when that channel is in use. The station computes a margin value based upon assessed quality factors. When the station gets an opportunity to transmit, the channel selection field of the transmitted packet identifies a channel which is selected based upon the margin value and the frequency of previous use of each of the channels. As a result, frequent switching among the channels occurs, with the percentage of use of each channel being dependent upon the assessed quality of that channel by the various stations.
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Olson Gene H.
Quy Dennis A.
Olms Douglas W.
Rosemount Inc.
Scotch, III Frank M.
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