The Digital Program Control Switch System, which based on the circuit switch, is still the main means of telecommunication field and plays an important role in the telecom network system.
以电路交换为基础的程控交换技术在当前的通信网中占有重要比重，它仍是当前通信的主要手段和研究内容。
The telephone network based on circuit-switching and digital program controlled exchanging technology plays an important role in the whole communicating networks.
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 digital channel includes the circuit section between an end user and the network, that is to say, the transmission on the end user's loop should be digitalized as well.
数字信道应包括用户到网络的连接线在内，即用户环路的传输也应是数字的。
The digital channel includes the circuit section between an end user and the network, that is to say, the transmission on the end user's loop should be digitalized as well.
数字信道应包括用户到网络的连接线在内，即用户环路的传输也应是数字的。
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