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Voice over TCP and UDP

Zhang, Xiaotang; Schulzrinne, Henning G.

We compare UDP and TCP when transmitting voice data using PlanetLab where we can do experiments globally. For TCP, we also do experiments using TCP NODELAY which sends out requests immediately. We compare the performance of different protocols by their 90th percentile delay and jitter. The performance of UDP is better than that of TCP NODELAY and the performance TCP NODELAY is better than that of TCP. We also explore the relation between TCP delay time minus the transmission time and the packet loss rate and find there is a linear relationship between them.

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Academic Units
Computer Science
Publisher
Department of Computer Science, Columbia University
Series
Columbia University Computer Science Technical Reports, CUCS-033-04
Published Here
April 22, 2011