Performance Optimization of Voice Traffic against Background Traffic over Asymmetric Digital Subscriber Lines
Iztok Humar, Mitja Golja, Janez Beöter, Saöo Tomaûi · Repository of the University of Ljubljana (University of Ljubljana) · 2008
One of major technical problems that hinder the pr omotion of voice communication over Asymmetric Digital Subscriber Lines is the unacceptable voice traffic performance in the presence of coexisting d ata traffic from other applications. In this paper, we study th e delay, caused by transmission of long non-real-ti me data packets over the bottleneck of low upstream bit-rat e of Asymmetric Digital Subscriber Line. In order t o retain the delay bellow the acceptable limit, we propose using lower values for Maximum Transmission Unit for the traffic deploying the link in addition to the standard IP Q uality of Service mechanisms. We investigated this approach through simulations and shown that performance of voice traffic is improved with respect to other data traffic even without increasing upstream bit-rate of the Asymmet ric Digital Subscriber Line.