论文部分内容阅读
1240数字程控交换机的主要功能特性是全分布控制,而全分布控制结构的关键是数字交换网络(digital switching network,DSN)。在12系统中,各模块的控制单元(control element,CE)都经由其终端接口(terminal interface,TERI)与数字交换网络相连,以传送彼此间的语音、数据、内部信号及测试信号等。换句话说,数字交换网络不仅代替了集中控制的传统交换网,而且还替换了集中控制机构对每个单独的终端设备进行通信和控制时所必需的、复杂的总线互通系统,其网络结构类似步进制交换网络所具有自由路径搜索的特性,减少了在软件设计和分布控
The key feature of 1240 digital PBX is full distribution control. The key to fully distributed control architecture is digital switching network (DSN). In 12 systems, the control elements (CEs) of each module are connected to the digital switching network via their terminal interfaces (TERIs) to transmit voice, data, internal signals and test signals to each other. In other words, the digital switching network not only replaces the centrally controlled traditional switching network but also replaces the complex bus interworking system necessary for the centralized control unit to communicate and control each individual terminal device with a similar network structure Stepping exchange network with the characteristics of free path search, reducing the software design and distributed control