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This paper presents a source model for variable bit rate (VBR) video traffic. A finite state Markov chain is shown to accurately model one-and two-layer video of all activity levels on a per source basis. Our model captures the source dynamics, including the short-term correlations essential for studying network performance. The modeling technique is shown to be applicable for both H.261 and MPEG2 encoded video of a variety of activity levels. The traffic model is shown in a simulation study todoi:10.1109/90.779209 fatcat:q6i22qn455fejj5yalqkggxxay