基于ATM网的视频业务传送测试

在ATM网上传送视频业务存在一些问题,信元时延变化(CDV)会产生视频信号定时抖动;信元丢失会引起视频信号不完整。文章简述对在ATM模拟试验环境中进行视频点播和在实际的ATM网上开通视频会议进行测试的两种典型方案,从网络角度,研究CDV和信元丢失率等因素对视频质量造成的影响,并对测试结果进行分析。

Thereare some problemsin transmittingvideoservicesover ATM,such as cell delayvariation(CDV)in ATM causingtimingjitterin the video signal;cell loss resultingin videosignalmissing.Thepaperpresentstwotypicaltestprojects:VOD over ATM simulationnetworkand videoconferenceserviceover actualATM network.From the pointof view of network,we will researchvideo qualityimpairmentcausedby cellloss and CDV in ATM and give the analysison testresults.