程控电话交换机总体设计若干问题初探

A basic discussion on population desigin for SPC switching system

从总体角度对程控交换机的制式、用户电路、交换网络、话务量计算、控制方式、信号方式、软件设计等问题进行了探讨。认为对局用机而言，交换网络以全Ｔ型为宜；控制方式提倡集中与分散相结合的方式；信号方式中共路信令是当今发展方向；软件设计中主张信令与业务分开以便各自扩展新项目；软件设计层次化和模块化技巧以及ＣＨＩＬＬ，ＳＤＬ，ＭＭＬ等语言的运用，在近代程控交换机设计中须给予重视。

Some important problems in population design for SPC switching system , such as :SPC switching modes, subscriber line circuits ,switching networks,trafficcalculations ,control modes ,signalling systems,software designs etc.,are dis-cussed. For office switching system ,it is adequate to adopt all Time Switch structure for the switching network ,to integrate centralized control with dis-tributed control for the control system,to introduce common channel signalling N,7 for the signalling system ,to separate the signalling software from the service software in software system,to undertake hierachical and modular tech- niques as well as the CCITT recommended CHILL, SDL ,MML in software de-sign.