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介绍了利用单片计算机控制MT－9075和M－976，进行集群专用系统中有线网络数字中继接口的设计，为集群专用通信系统的数字化和功能的进一步扩展所做的工作。
This paper introduces the design of the digital trunk interface of wired network in the special system of the trunking by controlling the MT-9075 and M-976 by using single-chip computer, and the work of further expansion of the digitization and function of the trunking private communication system.