Safety matters that need to be paid attention to during night repair of optical cables

Classification of optical cable line faults

According to the optical fiber interruption situation of the faulty optical cable, the fault types can be divided into three types: total optical cable interruption, partial unit interruption, and partial optical fiber interruption in the unit.

1.1 Full resistance of optical cables

If there are reservations on both sides of the site, adopt a centralized reservation method and add a joint;

There are joints near the fault point And there is enough reserve on site, so it can be solved by pulling the reserve and using the original connector;

There is neither reserve nor connector near the fault point, so it should be solved by extending the cable.

1.2 Some tubes or bundles in the optical cable are interrupted, or some optical fibers in a single tube or bundle are interrupted

On the premise that other optical fibers in use are not affected, it is recommended to use the skylight connection method. Repair the faulty optical fiber.

2 Analysis of the causes of optical cable line failures

The causes of optical cable line failures can be roughly divided into four categories: external factors, natural disasters, optical cable defects and human factors.

2.1 Line failures caused by external force factors

(1) External force excavation: To deal with the fault of the excavator during construction, the pipeline optical cable is opened to the manhole near the fault point to check whether the optical cable is in the hand of the operator. The well is damaged, and the optical cable is interrupted by two-way testing (2) Vehicle hang-up: When dealing with a vehicle hanging fault, the optical cable at the fault point should be tested in both directions first to confirm the number of optical cable interruptions, and then deal with it in a targeted manner.

(3) Shooting: This type of fault generally does not interrupt all optical fibers, but damages part of the optical cable or optical fiber. However, it is difficult to find this type of fault.

2.2 Line failures caused by natural disasters

Rat bites and bird pecks, fires, floods, strong winds, ice, lightning strikes, electric shocks

2.3 Causes of optical fiber itself Caused by line failures

(1) Natural fiber breakage: Because optical fibers are drawn from glass and plastic fibers and are relatively fragile, static fatigue will occur over time, and the optical fiber will gradually age and cause natural breakage. Fiber. Or water may enter the connector box, resulting in increased optical fiber loss or even fiber breakage.

(2) Effect of ambient temperature: Too low temperature will cause water to freeze in the connector box, the optical cable sheath to shrink longitudinally, and the pressure exerted on the optical fiber to produce micro-bending, which will increase attenuation or interrupt the optical fiber. If the temperature is too high, it is easy to damage the optical cable sheath and other protective materials and affect the characteristics of the optical fiber.