Asynchronous Transfer Model (ATM) is the basis of future broadband ISDN networks. In BISDNs, a major part of the traffic will be produced by multimedia sources like teleconferencing terminals and video-on-demand servers, because al the video applications are high-bandwidth-required, the huge link capacity provided by optical fibers can be quickly saturated by few video streams, in order to transmit them efficiently in B-ISDN networks, they must be compressed. Now there are several compression algorithms available, but streams generated by different video encoders exhibit different patterns. In this paper we investigate the traffic characteristics of video streams which are compressed based on the MPEG standard, and find that, the frame size distribution function is fitted by a Gamma distribution, all the B frames in a GOP have the same average size, the I frame is bigger than the P, B frame is a relative concept, the size change between two tandem same type frame obey an abnormal distribution.
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