How to distinguish the quality of fiber optic cable?
The following introduces ZR Cable central bundle tube optical cable GYXTW-8A.
Central bundle tube optical cable GYXTW-8A
1. Outer sheath: Indoor optical cables are generally made of polyvinyl chloride or flame retardant polyvinyl chloride. Appearance should be smooth, shiny, flexible and easy to peel. Poor-quality cable jackets are not smooth and tend to stick to tight sleeves and aramid fibers inside.
The PE jacket of the outdoor optical cable should be made of high-quality black polyethylene. After the cable is formed, the outer sheath is flat, bright, uniform in thickness and free of small air bubbles. The sheath of inferior optical cable is generally produced with recycled material, which can save a lot of cost. The sheath of this optical cable is not smooth. Due to the large amount of impurities in the raw material, the outer sheath of the optical cable made has many small holes, which will crack and enter after a long time. water.
2. Optical fiber: Regular optical cable manufacturers generally use A-grade fiber cores from major manufacturers. Some low-cost, low-quality fiber optic cables typically use Class C and Class D fibers and smuggled fibers of unknown origin. The sources of these fibers are complex, and the production time is long. It is usually soaked through and discolored, and multimode fiber is often mixed with single mode fiber. Generally speaking, small factories lack the necessary testing equipment to make judgments about the quality of the fibers. Since such optical fibers cannot be distinguished by the naked eye, common problems encountered in construction are: narrow bandwidth and short transmission distance; uneven thickness, which makes it impossible to connect pigtails; optical fibers lack flexibility and will break when coiled.
3. Reinforced steel wire: The steel wire of the regular manufacturer's outdoor optical cable is phosphated, and the surface is gray. This kind of steel wire does not increase the hydrogen loss after cabling, does not rust, and has high strength. Inferior optical cables are generally replaced with thin iron wires or aluminum wires. The identification method is easy to see, the appearance is white, and it can be bent at will in the hand. The optical cable produced with this kind of steel wire has a large hydrogen loss, and the two ends of the optical fiber box will rust and break for a long time.
4. Steel armor: Regular production enterprises use longitudinally wound steel tape, coated with anti-rust paint on both sides, and ordinary iron sheets are used for inferior optical cables, usually only one side is treated with anti-rust treatment.
5. Loose tube: The loose tube of the optical fiber in the optical cable should be made of PBT material. This kind of tube has high strength, no deformation and anti-aging. Inferior optical cables generally use PVC sleeves. The outer diameter of this kind of shell is very thin, and it will flatten when squeezed by hand, a bit like a drinking straw.
6. Optical fiber paste: The optical fiber paste in the outdoor optical cable can prevent the oxidation of the optical fiber. Due to the ingress of moisture and moisture, very little optical fiber paste is used in inferior optical fibers, which seriously affects the life of the optical fibers.
7. Aramid, also known as Kevlar, is a high-strength chemical fiber that is currently most used in the military industry. Military helmets and bulletproof vests are produced from this material. At present, only DuPont and Aksu in the Netherlands can produce, and the price is around 300,000 tons.
Both indoor fiber optic cables and power overhead cables (ADSS) use aramid yarns as reinforcement. Due to the high cost of aramid fiber, inferior indoor optical cables are generally made with a very small outer diameter, so that a few strands of aramid fiber can be used to save costs. Such a cable can easily be pulled and broken when passing through the tube.
Because ADSS optical cable determines the amount of aramid fiber in the optical cable according to the span and the wind speed per second, it is generally not afraid of cutting corners. Kevlar is not included, as we use center tube light armored fiber optic cables for testing.
Eight, the diameter of the optical cable, for the central bundle tube optical cable, the diameter standard is generally about 7.5mm, plus or minus 0.2mm can also be.