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传统的数据通信通常无时限要求。它们可长可短,易产生突发。而音频和视频具有实时性和持续性,如传统的话音业务。综合业务数字网(ＩＳＤＮ)和高带宽干线,如同步光纤网/同步数字体系(Ｓｏｎｅｔ/ＳＤＨ)和异步传递模式(ＡＴＭ)的全球标准化使得电信基础设施的应用和互联增长迅速
Traditional data communications often have no time limit. They can be long and short, prone to sudden. The audio and video with real-time and continuity, such as the traditional voice business. The global standardization of Integrated Services Digital Network (ISDN) and high bandwidth trunks, such as Synchronous Optical Network / Sonet / SDH and Asynchronous Transfer Mode (ATM), has led to rapid growth in the application and interconnection of telecom infrastructure