【摘要】 叙述了ＩＳＤＮ的基本定义，建立ＩＳＤＮ的原则，Ｂ－ＩＳＤＮ的发展以及世界发达国家发展Ｂ－ＩＳＤＮ的策略；提出了发展铁路ＩＳＤＮ（Ｒ－ＩＳＤＮ）的设想和建议，希望这些建议能引起更多同志的关注，参与研讨，以使早日实现我国的Ｒ－ＩＳＤＮ。更多还原

【Abstract】 This paper describes the basic definition and the constructive principle of ISDN,the development and the strategies of B ISDN in the developed countries of the world.The article gives also the concept of Railway Integrated Service Digital Network (R ISDN),the imagination and the proposal of the R ISDN in China.It is desired that the proposal will to be noticed and discussed,so that the R ISDN will be achieved early in China .更多还原