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利用多信道共用原理 ,研制了电话线路扩容器 ;设计了交换机侧扩容器和用户侧扩容器的硬件和软件 ;对多信道共用的电话线路配置理论进行了研究 ,并对增加内部通话功能后扩容用户的呼损进行了分析
Based on the principle of multi-channel sharing, a telephone line expansion device is developed. Hardware and software of the switch-side expansion and user-side expansion are designed. The theory of telephone line configuration shared by multiple channels is studied. User call loss analysis