Abstract: The effect of a special ABR source, Source-bottleneck source, on the performance of several ABR flow-control algorithms is studied.TM4.0 require ABR source changes its rate according to network'sdemand.But Source-bottleneck source for some reason cannot do this perfectly insome time.If flow-control algorithms cannot discover this, algorithms may distribute more bandwidths to a Source-bottleneck source than it can use.This distribution is unfair to non-Source-bottleneck sources.This article studies several algorithms through ATM simulator and analyses the experimental results.

Key words: ATM network, ABR service, Source-bottleneck source