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80年代以来,电信发达国家在加速实现电信网数字化的同时,相继进行了ISDN的研究试验,并陆续投入商用。本文介绍了部分国家ISDN的试验与应用情况,分析了向B-ISDN发展的趋势,并对作为B-ISDN基础的ATM技术、SONET网以及一些国家向B-ISDN过渡的策略做了简要分析。最后概述了电信网智能化和和个人化发展趋势。
Since the 1980s, while the developed countries in telecommunications have accelerated the digitalization of telecommunications networks, they have conducted ISDN research experiments in succession and put them into commercial use one after another. This paper introduces the test and application of ISDN in some countries, analyzes the trend of development to B-ISDN, and briefly analyzes the ATM technology based on B-ISDN, SONET network and some countries’ transition strategy to B-ISDN. Finally, it summarizes the trend of intelligentization and personalization of telecom network.