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国外除了敷设地下光缆外,还在架空通信线路塔或输电线路塔上广泛敷设光缆。由于某种原因,例如常年冻土、多石土,过河、深沼泽及其他障碍,不可能把光缆敷设于地下或管道,这时采用架空光缆是合理的。此外,架空光缆对使用维护部门有一系列的显著优点:光通信线路的建设速度较快,查找光缆故障段较为方便,光缆故障几率小,即1000公里上每年少于一次故障,因而其可靠性较地下光通信线路高。把光缆架设在输电线路塔上,可以不用敷设另外的架空线路就能实施全国范围及主管部门的多路数字通信。
In addition to the laying of underground fiber optic cable in foreign countries, but also in the overhead communication tower or transmission line tower widely laid fiber optic cable. For some reason, such as permafrost, rocky soil, crossing the river, swampy swamps and other obstacles, it is not possible to lay fiber optic cables underground or in pipelines. In this case, it is reasonable to use overhead fiber optic cables. In addition, overhead optical cables have a series of significant advantages to the use and maintenance departments: the optical communication lines are constructed rapidly, and it is convenient to find fault sections of optical cables. The probability of failure of optical cables is small, that is, there is less than one failure per 1,000 km. Therefore, Underground optical communication line is high. The optical cable erected in the transmission line tower, you can not laying additional overhead lines can be implemented across the country and the competent department of multi-channel digital communications.