... CS ChipSet 芯片组 CS Circuit Switching 电路交换技术 CS Classware Server 课件服务器（远距离教学系统的构件） ...
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随着电信技术的进步，基于电路交换技术的PSTN正逐步向下一代网络（NGN）过渡。
With the progress of telecommunication technology, PSTN based on circuit switch technology is carrying out the transition to the Next Generation Network (NGN) increasingly.
交换技术有两种基本类型：电路交换和报文交换。
There are two basic types of switching techniques: circuit switching and message switching.
以电路交换和数字程控交换技术为基础的电话网更是在整个通信网中占据着重要的地位。
The telephone network based on circuit-switching and digital program controlled exchanging technology plays an important role in the whole communicating networks.
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