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本文论述了ISDN的一些基本原则,特别讨论了业务情况以及引入ISDN的起因和必须具备的条件;简述了CCITT建议的现状并概述了有关ISDN未来发展的趋势。
This article discusses some of the basic principles of ISDN. In particular, it discusses the business conditions and the causes of the introduction of ISDN. It outlines the current status of CCITT recommendations and outlines the future trends regarding ISDN.