Communication system for connecting a plurality of...

Details Communication system for connecting a plurality of... Communication system for connecting a plurality of...

G - Physics

08

C

354/235

G08C 13/00 (2006.01) H04L 12/52 (2006.01) H04L 12/56 (2006.01)

Patent

CA 1169974

COMMUNICATION SYSTEM FOR CONNECTING A PLURALITY OF ASYNCHRONOUS DATA PROCESSING TERMINALS ABSTRACT OF THE DISCLOSURE A communications system concentrator intended to interconnect a number of asynchronous data processing terminals operating at different speeds among themselves, or to a high speed switching or communication network. The concentrator uses as a time multiplexed loop a link with the terminals later duplicated for security reasons. The number of terminals that may be hooked up may exceed that which would be allowed if all were active simultaneously. For this purpose, a signalling or watch function is used in the concentrator to watch the state of each terminal. This function which assumes the active or rest state of the terminals, is based on a low speed search for terminals at rest, on detecting the change in their states and on the allocation, in time sharing, of the time multiplexed transmission resource among the active terminals according to their needs. The time sharing of the transmission resource is adaptive.

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