Multiplex communications – Wide area network – Packet switching
Patent
1991-04-16
1993-03-30
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 15, H04J 116
Patent
active
051990253
ABSTRACT:
A loop back method for a network including a plurality of node units connected in loop by duplexed transmission lines in the opposite directions with each other, wherein the respective node units have a function of detecting failure on the duplexed transmission lines and a loop back function for returning data received from one of the transmission lines to one of the other in the opposite direction, one of the node units commands loop back to all other node units upon detecting failure on the transmission lines, and the one node unit commands the determination of a loop back state to all other node units to thereby perform a loop back operation for the whole network.
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Hom Shick
Matsushita Electric - Industrial Co., Ltd.
Olms Douglas W.
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