Firstly , the paper compares v . 90 , modem , xdsl , isdn in their characters , difficulties , management and costs . finally , we choose to construct the h . 320 multi - media communication system based on n - isdn . secondly , in the theoretical part of the paper , the basic theory of h . 320 multi - media communication is introduced , such as the compression of video and audio data , h . 320 stack protocol and especially introduced the theory , relative protocol and the technique of access to the net of n - isdn 本文针对铜线接入技术应用的基础和现状,对v . 90 、 modem 、 xdsl 、 isdn等接入方式的技术特点、接入难度、运行管理和经济性等方面进行对比分析,结合接入的具体环境,通信需求和经济性等方面的特点,重点阐述了n ? isdn接入方案的可行性和“基于n ? isdn接入的h . 320多媒体通信系统”的实现方案。
The multi - media communication system studied in the paper is applied to safe production monitor and management system in pengzhou , sichuan province , which is also can be used in video phone , long - distance education , traffic management , no man monitor system etc . in a word , the research can be widely used in copper - wire net access systems 本研究课题出自四川省彭州市远程安全生产监控与管理信息系统的多媒体通信子系统,所用n ? isdn接入具有广泛的适用性,根据应用的具体情况,稍作改动即可在可视电话、远程教育、交通管理、无人值守监测监控等方面发挥作用,故在铜线网接入环境下具有较高的推广应用价值。