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我国长途模拟网已初具规模,模拟通信技术比较成熟,经济效益较好,全套设备国内均能大量生产,应继续发展并提高质量。对现有的明线,对称电缆,小同轴、中同轴电缆应继续进行挖潜扩容。一般情况下,一级干线不宜发展明线,二级干线和一些业务量不大而又急需解决通信的地区,仍可根据需要适当发展明线。2000年前,明线在国内仍占相当比重,要提高复用程度,积极用好。在电缆载波通信中;长途干线根据具体情况采用各种容量的中、小同轴电缆和对称电缆;对已铺设的同轴和对称电缆要挖潜改造,采用扩容技术。
China’s long-distance analog network has begun to take shape, analog communications technology is relatively mature, better economic efficiency, a full set of equipment can be mass production in the country, should continue to develop and improve quality. On the existing open wire, symmetrical cables, small coaxial, coaxial cable should continue to tap the potential expansion. Under normal circumstances, the development of a trunk line should not be, the second trunk line and some traffic is small and urgent need to address the communications area, the development of the line can still be properly developed as needed. 2000 years ago, the open line still accounts for a large proportion in the country. To enhance the reuse level, make good use of it. In the cable carrier communication; long-distance trunk according to the specific circumstances using a variety of medium and small coaxial cables and symmetrical cables; laid coaxial and symmetrical cable to tap the potential transformation, the use of expansion technology.