In the choice of fiber optic cable, often do not know what kind of cable quality is good, is at ease,
The following is a summary, which can be judged from seven aspects:
1. the skin
Indoor fiber optic cables generally use polyvinyl or flame retardant polyvinyl, appearance should be smooth, bright, flexible, easy to peel. Poor quality of optical cable skin smoothness is not good, easy and inside the tight cover, aramid adhesion. Outdoor cable PE sheath should use black polyethylene, after the cable skin level off, bright, uniform thickness, no small bubbles.
Inferior fiber optic cable skin is generally produced with recycled materials, so you can save a lot of costs, such a cable skin is not smooth, because of a lot of impurities in the raw material, make the fiber optic cable skin has a lot of small pit wow, long time on cracking, water.
2. optical fiber
Regular cable production enterprise generally USES metal grade A fiber core, some cheap inferior cable usually use C, D fiber and unknown smuggling fiber, the fiber source is complicated, the factory for A long time, often feel has damp discoloration, and multimode optical fiber is often mixed with single mode fiber, and the lack of necessary testing equipment of general small plant, not to judge the quality of optical fiber. Because the naked eye can not distinguish such optical fiber, construction often encountered problems are: the bandwidth is very narrow, short transmission distance; Uneven thickness, and tail fiber butt; Fiber fibers lack flexibility and break when twisted.
3. Loosen the casing
Fiber optic cable installed in the loose sleeve should be PBT material, such a sleeve high strength, no deformation, anti - aging.
Poor quality optical cable is usually made of PVC casing, such a casing outside diameter is very thin, with the hand on the flat, a little like we drink drink straw.
4. fine cream
The fiber cream inside outdoor fiber optic cable can prevent fiber oxidation, because water and gas into the damp, the fiber cream in poor quality fiber is very few, seriously affect the life of the fiber.
5. aramid
Also known as kevlar, is a high-strength chemical fiber, currently used in the military industry more, the military helmet, bulletproof vest is this material production. At present, only dupont and the Dutch aksu can produce, the price is about more than 300,000 tons.
Indoor optical cable and electric power overhead optical cable (ADSS) are reinforced with aramid yarn, because aramid cost is higher, poor quality indoor optical cable generally do the outer diameter is very fine, so you can use a few aramid fiber to save the cost. Such fibre-optic cables can easily be pulled apart when running through a tube. ADSS fiber optic cable because it is based on the span, the wind speed per second to determine the use of aramid fiber optic cable, generally dare not cut corners.
6. Reinforcing steel wire
Regular manufacturers of outdoor cable steel wire is phosphating treatment, the surface is gray, such steel wire into the cable does not increase the hydrogen damage, not rust, high strength. Inferior cable is commonly replaced with fine wire or aluminum wire, identification method is very easy - white appearance, pinched in the hand can be bent at will. The cable hydrogen loss that produces with such steel wire is big, time grew, hang the two ends of optical fiber box to be able to rust fracture.
7. armor
Regular production enterprises use double-sided coated plastic steel belt longitudinal wrapped cable, improve the ability of moisture permeability, to prevent the longitudinal leakage of cable water. Poor quality cable is used by the ordinary iron, usually only one side of the rust treatment.
