On the Performance of Networks Carrying Multimedia Traffic
The subject matter of this chapter is the performance of networks carrying multimedia traffic. The focus is particularly on audio/video traffic, since they constitute the types of media with the most stringent requirements, especially in terms of bandwidth and delay. The dependence of video traffic characteristics on the video encoding scheme and its control, as well as on the content, is illustrated by giving results for several example cases. The performance of Ethernets and ATM networks carrying video traffic is then addressed. The performance evaluation is undertaken by means of computer simulation, using real video sequences. All the delays in the system, starting with the camera, and ending with the display, are taken into account. Given the specific nature of the network considered and the maximum latency requirement, some data is lost. Loss of data at the receiver causes glitches in the display of video. The effect of data loss is thus measured in terms of the spatial extent, duration, and rate of glitches experienced as a function of the number of video streams, the delay requirement of the video application, and the video rate. Conversely, the performance of a network is measured in terms of the number of video streams that can be supported for a given maximum delay requirement and a given glitch rate, duration, and spatial extent.
KeywordsLime Expense Convolution Dmax Avenge
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