An overhead cable is a fiber optic cable that is used on a pole. This laying method can utilize the original overhead open line road to save construction costs and shorten the construction period. The overhead cable is hung on the pole and is required to adapt to various natural environments. Aerial optical cables are vulnerable to natural disasters such as typhoons, ice, floods, etc., and are also susceptible to external forces and weakened mechanical strength. Therefore, the failure rate of overhead cables is higher than that of direct-buried and ducted fiber-optic cables. Generally used for long-distance secondary or lower-level lines, suitable for dedicated network cable lines or some local special sections.
A. Hanging wire supports overhead, this method is simple and cheap, and it is the most widely used in China, but it is more time-consuming to hook up and hang.
B. Hanging wire winding overhead mode, this method is more stable and less maintenance work. But a special entanglement machine is needed.
C. Self-supporting overhead type, high requirements for line drying, difficult construction and maintenance, high cost, and rarely used in China.
D. When overhead, the fiber optic cable should be connected to the trunk of the line to be guided, and the cable should be avoided. Pay attention to reducing the friction when pulling the outdoor cable. A cable for expansion and contraction is left on each of the stems.
E. Pay attention to the reliable grounding of metal objects in the cable. Especially in mountainous areas, high-voltage power grid areas and many areas, there are generally 3 grounding points per kilometer, and even non-metallic optical cables are used.