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关于S 1240数字交换网络四级四个平面的结构及其简要工作原理,可参阅有关参考文献。这里准备在此基础上作进一步的叙述。(一)各级接线器之间的连接规律:S 1240数字交换网络各级接线器之间以及接线器和各种终端之间的连接是有一定规律的。下面首先谈一下入口接线器和各种终端、第二级组接线器之间的连接关系。在S 1240机中,一对入口接线器称为一个终端分单元,四对入口接线
About S 1240 digital switching network four four plane structure and its brief working principle, can refer to the relevant references. Here on the basis for further narrative. (A) the connection between the various levels of connection between the rules: S 1240 digital switching network switches at all levels and the connection between the terminal and a variety of terminals is a certain law. The following first talk about the entrance connector and a variety of terminals, the connection between the second-level group of connectors. In the S 1240 machine, a pair of entry switches called a terminal sub-unit, four pairs of entry wiring