用预编程序控制交换接续的市内和长途电话交换机。利用了计算机技术，接续快，体积、功耗、噪音小，维护方便，且灵活性强，只要变换或增加相应程序，就可实现交换性能的变更，如呼叫转移、自动回叫、三方会议等。
文章详细信息 关键词： 急救报警;;数字程控交换;;多媒体 [gap=375]Keywords: first aid alarm;digital program control switching;multimedia
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数字程控交换机 Digital SPC Switch ; PBX-D
程控数字交换 Program Controling of Digital Exchange ; program control digital switching
程控数字自动交换机 PABXPrivate Auntomatic Branch Exchange
程控数字交换机 SPC digital switch ; PABX ; SPC digital exchanges
程控数字电话交换机 SPCDTSSstored program colled digital telephone switching system
数字式程控电话交换机 digital program-controlled switching ap-paratus
本文研究的即为适用于电力部门的小型数字程控交换系统。
The small digital programmable exchange system studied in this paper is suitable for electric department.
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。
Subscriber line interface circuit is an important part of digital program-controlled switching system.
介绍一种数字程控交换实验系统的组成和原理，以及系统硬件和软件的实现。
This paper introduces the component and principle of Digital Program Control Exchange Experimental System, as well as the realization of the hardware and software.
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