This paper introduces the component and principle of Digital Program ControlExchange 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。
2
Making use of microcomputer techniques, the interface collects information from common controlexchange HJ-921 and repeats called subscriber number to rural telephone exchange.