Making use of microcomputer techniques, the interface collects information from common control exchange HJ-921 and repeats called subscriber number to rural telephone exchange.
该接口利用微型计算机技术从HJ—921型交换机的公共控制设备采集，并向农村支局自动交换机转发被叫用户号码。
This paper introduces the component and principle of Digital Program Control Exchange Experimental System, as well as the realization of the hardware and software.
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.
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。
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