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。
In electric power system, Digital Program Controlled Exchange has been used broadly because communications requests high reliability.
在电力系统中，由于对通信的可靠性要求较高，因此程控数字交换机正在得到广泛的应用。
The memory control block (MCB) shown in Fig. 1 is widely used in digital program-controlled switching systems, telecommunication equipments and other automatic control equipments.
图1所示的存储控制模块MCB在数字程控交换机等通信设备和自动控制设备中得到大量应用。
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