Algorithm for selecting channels for multiplexer frame

Multiplex communications – Wide area network – Packet switching

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379112, H04J 312

Patent

active

048887706

ABSTRACT:
An algorithm for ordering selects for a plurality of channels to be multiplexed into a frame is provided. A channel ready counter and a channel select position counter for each of the channels to be multiplexed are initialized. The first and succeeding channel selects are chosen based primarily on the respective values of the channel ready counters such that a channel having a ready counter of relative higher value is always selected before a channel having a ready counter of relative lower value. Where channel ready counter integer values of more than one channel are equal, the select is chosen on the secondary basis of channel rate, with the highest rate channel of the highest ready count contributing first. After a select is made, the ready counter of the selected channel is determined, and the position counters of the channels are decremented by a value corresponding to the number of selects for that channel in the frame. If the position counter of a channel reach zero or goes negative as a result of the decrementing, the position counter of that channel is increased by the total number of selects in the frame, and the ready counter for that channel is incremented by one. After such updating, another selection for the frame may be made based on the ready counter values of the channels. The provided algorithm guarantees that no channel will ever have an excursion of more than one bit available for placement in the frame.

REFERENCES:
patent: 4410765 (1983-10-01), Hestad et al.
patent: 4585904 (1986-04-01), Mincone et al.
patent: 4607144 (1986-08-01), Carmen et al.
patent: 4727536 (1988-02-01), Reeves et al.

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