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农村通信、市话扩容以及铁路、石油、电力、矿山等部门的调度指挥通信急需一种新型设备对现有传输线路进行挖潜革新,随着经济体制的改革,农村乡镇企业的发展,通信需求量的急剧增加,更需要一种不增或少增新线路而提高原有线路复用指数的新设备,以缓解当前电路严重不足的状况。ZZD85型10路环路载波设备就是针对上述情况而研制的。该设备既保留了常规载波机特性,又具有自己的独特性能,既可复用于现有广大农村的架空铁线,又
Rural communication, local telephone expansion and dispatch and command communications in railway, petroleum, electric power, mining and other departments urgently need a new type of equipment to tap the potential of existing transmission lines. With the reform of economic system, the development of rural township and village enterprises, the demand for communication The sharp increase also requires a new device that increases the multiplexing index of the original line without increasing or decreasing the number of new lines so as to alleviate the current serious shortage of circuits. ZZD85 10-way loop carrier equipment is developed for the above situation. The device not only retains the conventional carrier characteristics, but also has its own unique performance, both can be used in the vast majority of rural existing overhead lines, and