Multiplex communications – Wide area network – Packet switching
Patent
1985-11-29
1987-10-20
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 13, 3408255, H04J 302, H04J 116
Patent
active
047019107
ABSTRACT:
The subject invention comprises method and apparatus for providing protection against an open transmit cable, an open receive cable and/or a failed BIU in a local area network. Each BIU of the network is adapted to monitor tansmissions received from its predecessor to determine whether the primary transmit channel coupling it to its predecessor is open circuited and, if so, to reestablish communications between it and its predecessor over an auxiliary transmit channel. Further, each BIU is adapted to monitor transmissions received over the primary receive channel of the network to determine whether the channel is idle and, if so, to begin receiving message signals over an auxiliary receive channel. Lastly, a network control center is provided to monitor the transmit medium to determine whether a BIU is "babbling", i.e., transmitting signals for longer than is permitted by the network protocol and, if so, to identify the babbling BIU and, thereafter, remove the babbling BIU from the network.
REFERENCES:
patent: 4387425 (1983-06-01), El-Gohary
patent: 4530085 (1985-07-01), Hamada et al.
Burgujian Richard V.
Davis Jr. James C.
General Electric Company
Griffin Robert L.
Kuntz Curtis
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