WEIGHTED ROUND-ROBIN MULTIPLEXING OF ATM CELLS BY UPDATING WEIGHTS WITH COUNTER OUTPUTS

摘要

In an ATM network node, cells of different service classes arestored in respective buffers and counters respectively associated with thebuffers are initially loaded with full-count values respectivelycorresponding to the weight valeus of the service classes. The initialfull-count values are updated respectively with the output values of theassociated counters. Control circuitry sequentially interrogates the buffersand the counters in a round-robin fashion. If the output value of eachinterrogated counter is not decremented to a predetermined value, a cellis forwarded from the associated buffer and the counter is decrementedby one. At the end of a round robin cycle, all of the counters are reloadedwith the initial full-count values or the updated full-count valuesdepending on the number of cells forwarded from each of the buffers.