Subscriber line interface circuit is an important part of digital program-controlled switching system.
模拟用户线接口电路是数字程控交换系统的重要组成部分。
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。
Postal and telecommunications to achieve the program-controlled exchange, digital transmission will take the lead in the province completed the first telephone counties.
邮电通讯实现了交换程控化，传输数字化，并率先在全省建成了第一个电话县。
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