3、程控交换（Program-controlled exchange）：程控电话交换机就是电子计算机控制的电话交换机，它是利用电子计算机技术，用预先编好的程序来控制电话的接续工作。
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Program-controlled exchange technology 程控交换技术
digital program controlled exchange 数字程控交换
The paper researches the principle of exchange of the digital program-controlled switches, and make the function of the program-controlled exchange to a large-capacity FPGA chip, and on this basis, and design a small number of program-controlled switches hardware and software.
本文针对数字程控交换机的交换原理进行了研究，将程控交换所实现的功能设计到一块大容量的FPGA芯片上，并在此基础上进行了小型数字程控交换机的硬件和软件的设计。
参考来源 - 基于FPGA的小型程控交换机的设计—《电脑知识与技术·学术交流》—2008年第20期—龙源期刊网·2,447,543篇论文数据，部分数据来源于NoteExpress
The telecommunications are more advanced with the program-controlled exchange and digital transmission.
通讯上实现了交换程控化、传输数字化。
As a key professional specialty course of electronic information technology, program-controlled exchange has been set up at various colleges and universities generally.
程控交换技术作为电子信息类专业重要专业课程，已在各高校普遍开设。
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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