Method and means for demand accessing and broadcast...

Details Method and means for demand accessing and broadcast... Method and means for demand accessing and broadcast...

H - Electricity

04

B

340/84

H04B 1/38 (2006.01) H04B 3/50 (2006.01) H04L 12/44 (2006.01) H04L 12/56 (2006.01)

Patent

CA 1141838

METHOD AND MEANS FOR DEMAND ACCESSING AND BROADCAST TRANSMISSION AMONG PORTS IN A DISTRIBUTED STAR NETWORK Abstract A demand access broadcast transmission method and means capable of supporting random port access and any-to-any transmission at very high data rates. A communication medium formed from an inverted tree network of nodes and full duplex connecting links permits the establishment of a path lock up-link through the network from a demanding port to a root node on a first-come first-serve demand access basis with arbi- tration at each distinct tree node level. Broadcast transmission is perfected down-link over all fan-out paths from the root node. Collision is avoided by locking a path to a port and by limiting race condi- tions among active ports to only the leading edges of messages. Thus, relinquishment of a broadcast channel overlapped with retransmission of a message does not result in path seizure since the occurrence of message leading edges is the singular path connection invoking event. SA9-79-011

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