The causes of fiber optic cable line failures can be roughly divided into four categories: external forces, natural disasters, the shortcomings of fiber optic cables, and human factors.
1. Line failure caused by external forces
(1) External force excavation: Handle the failure of excavator construction. The pipeline cable is opened by a manhole near the fault point to see if the cable is damaged in the manhole, and the cable is interrupted in both directions
(2) Vehicle hang-up: When dealing with a vehicle-hanging fault, the fiber optic cable at the faulty point should be tested in two directions first to confirm the number of blocked optical cables, and then deal with it in a targeted manner.
(3) Shooting: This type of failure generally does not interrupt all optical fibers, but some optical cable parts or optical fibers are damaged, but it is more difficult to find such failures.
2. Line failure caused by natural disasters
Mole biting and bird pecking, fire, flood, wind, ice, lightning, electric shock
Fiber optic cable
3. Line failure caused by the fiber optic cable itself
1 (1) Natural fiber break: Because the optical fiber is drawn from glass and plastic fibers, it is relatively fragile. Static fatigue will occur over time, and the optical fiber will gradually age and cause natural fiber break. Or water in the splice box will cause increased fiber loss and even fiber breakage.
(2) Influence of ambient temperature: If the temperature is too low, the water in the splice box will freeze, the optical cable jacket will shrink longitudinally, and the micro-bending caused by pressure on the optical fiber will increase the attenuation or interrupt the optical fiber. If the temperature is too high, it will easily damage the optical cable jacket and other protective materials and affect the characteristics of the optical fiber.
