How to choose their own cable?

Much more complex than the coaxial cable to buy, and not simply to compare how much the price of several core measure, but according to the cable structure, selection of raw materials, production processes and technical indicators into account, do not use the price is too cheap the product.

A cable according to use selection
Use of purchase in accordance with the appropriate cable, according to different purposes, fiber optic cable can be divided into aerial cable, buried cable, pipe cable, fiber optic submarine cable and other non-metal. Aerial cable require high strength, temperature coefficient; Buried anti-buried cable requirements, compression, moisture-proof, anti-humidity properties and good resistance to chemical attack; pipelines and submarine fiber optic cable will have resistance to pressure, tension-resistant, waterproof properties is good; no with metal and high-voltage cable can be set up, the insulation is better, although there is no iron core body strengthening, but also with a certain tensile strength.

Second, according to the number of selected core cable
Selected according to the number of different types of core cable structure can be divided into central beam tube, stranding type, frame type and ribbon type, and so several different structures without the use of the same, the user can submit the corresponding requirements under the line. General adoption of the following 12 core center beam tube, the center beam tube process simple and low cost in overhead pipe laying or have a good network of branch lines to protect the competitive; layer stranded fiber optic cable strand or single-use center placed wire to strengthen the root, with SZ continued synthetic cable, fiber cabling up to 144 the number of cores. Its biggest advantage is waterproof, strong pull, a strong lateral pressure. Can be used for direct buried. At the same time easy-to-fork, some fiber-optic cable that used to be, respectively, without breaking the entire cable, just need the fiber breaking bifurcation can, which for the data communications network. Additional optical node along the cable TV network is beneficial; ribbon cable cores can do thousands of cores, it is 4 to 12 fiber arranged in rows to form ribbon fiber unit, then a certain number of ribbon units means arranged in cable, fiber optic cable network level and the beam tube is generally used in two kinds of layers can be added.

Third, according to the material selected cable
Fiber optic cable used in cable materials and manufacturing processes related to the fiber material selection is the key to life. The impact of fiber optic cable manufacturing process is an important part of quality, process stability, good quality products. In the cable manufacturing process is basically not included in the additional loss optical fiber. The main ingredient in the cable are: core, fiber optic ointment, sheath materials, PBT (poly butylene stupid acid), they have different quality requirements, core requirements of a larger power capacity charge, higher signal to noise ratio, a lower bit error rate, longer amplifier spacing, the higher information carrying capacity; optical fiber bundle in the ointment is a tube filled with ointment, and its role first, to prevent moisture in the air erosion of fiber, the second is the role of the fiber from the liner, buffered fibers by vibration or shocks. Ointment have strict quality requirements, emphasizing the low amount of hydrogen, to ensure that low-temperature characteristics of a good cable, to prevent the "hydrogen loss" cause serious damage to the cable. Long-term reliability of fiber optic cable jacket material has a very important role, is to determine the cable tension, flattening, bending characteristics, temperature characteristics, resistance to natural aging (temperature, irradiation, chemical corrosion) properties, and fatigue characteristics of the cable key. It should use high-density polyethylene (PE), it has a hardness, tensile compression performance, the skin is not easy to damage; PBT is the production of fiber secondary coating (beam tube) of the thermoplastic engineering plastics, must have a Young's modulus high (1600/mm2), low coefficient of line sheets (1.5 × 10 - 4), good chemical resistance, good processing properties, friction coefficient and so on. PBT fiber casing material to do with that unit optical beam tube has good resistance to lateral pressure and temperature characteristics. Relatively high in the water solution where required, in order to ensure long-life cable, you must use anti-hydrolysis of PBT material.