Method of operating a two-wire local area network such that...

Details Method of operating a two-wire local area network such that... Method of operating a two-wire local area network such that...

H - Electricity

04

L

340/71

H04L 1/00 (2006.01) H04L 12/437 (2006.01)

Patent

CA 1246173

-17- ABSTRACT OF THE DISCLOSURE METHOD OF OPERATING A TWO-WIRE LOCAL AREA NETWORK SUCH THAT MARGINAL COMPONENTS IN THE SECONDARY LOOP ARE LOCATED A method of operating a local area network of the type that has a plurality of stations which are serially intercoupled in primary and secondary loops includes the steps of: circulating all messages around the primary loop in a first direction through respective primary trans- mitters, primary receivers, and primary cabling in each station during one set of spaced apart time intervals; and circulating all messages around the secondary loop in an opposite direction through respective secondary trans- mitters, secondary receivers, and secondary cabling in each station during another set of time intervals that are interleaved with the one set. As the messages circulate in the primary and secondary loops, they pass through a single transient error detector circuit in each station. This locates marginal components and ensures a reliable loopback mode of operation when a component fails completely.

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