Method and means for demand accessing and broadcast transmission

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

1979-11-21

1982-08-31

Swann, III, Glen R.

Communications: electrical

Continuously variable indicating

With meter reading

370 60, 370 94, H04Q 360

Patent

active

043474985

ABSTRACT:
A demand access broadcast transmission method and means is capable of supporting random port access and any-to-any transmission at very high data rates. A communication medium (FIG. 2) formed from an inverted tree network of nodes (1, 18, 22) and full duplex connecting links (13, 17, 19) 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 arbitration at each distinct tree node level (FIG. 3). 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 conditions among active ports to only the leading edges of messages. Thus, relinquishment of a broadcast channel overlapped with transmission of a message does not result in path seizure since the occurrence of message leading edges is the singular path connection invoking event.

REFERENCES:
patent: 3693155 (1972-09-01), Crafton et al.
patent: 3889064 (1975-06-01), Fletcher
patent: 3914743 (1975-10-01), Fitch et al.
patent: 4013959 (1977-03-01), Patterson
patent: 4048441 (1977-09-01), Young
patent: 4063220 (1977-12-01), Metcalfe et al.

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