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近几年来ISDN从低谷走出,多媒体桌面办公系统和接入In-ternet使ISDN有了广泛市场前景。我国北京、上海、广州、深圳、南京等地区在进行ISDN现场试验,使ISDN在信息服务的领域发挥作用。邮电部传输所在部科技司的部署下,拓展国家“七五”和“八五”ISDN攻关项目的多年实践和ITU-T以及ETSI相关国际标准分链与多个厂家的技术谈判,在我国公用网ISDN标准制定方面取得了显著的成果。目前已经制定了《ISDN技术体制》;《ISDN用户—网络接口技术规范》,简称DSSI(包括物理层,链路层、网络
In recent years ISDN from the bottom out, multimedia desktop office systems and access to In-ternet ISDN has a broad market prospects. China’s Beijing, Shanghai, Guangzhou, Shenzhen, Nanjing and other regions in the ISDN field trials, ISDN in the field of information services play a role. Under the deployment of the Ministry of Science and Technology of the Ministry of Posts and Telecommunications, the Ministry of Posts and Telecommunications has extended the years’ practice of the ISDN research projects of the “Seventh Five-Year Plan” and the “Eighth-Five-Year Plan” and the technical negotiations of ITU-T and ETSI relevant international standards with multiple manufacturers and public utility in our country Significant achievements have been made in the development of the ISDN standard. At present, “ISDN technical system” has been formulated; “ISDN user-network interface specification”, referred to as DSSI (including physical layer, link layer, network