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利用PCM传输线路的数据网包括同步数据复接器和数据交换机。本文以电子数据交换(EDS)系统的同步网所用的系统单元作为例子,论述了这些复接器和交换机的功能。
Data networks utilizing PCM transmission lines include synchronous data multiplexers and data switches. This paper discusses the functions of these multiplexers and switches by taking the system unit used in the synchronous network of electronic data exchange (EDS) system as an example.