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:: Environment requirement on outdoor fiber
fiber cables must endure outside attacks the environment, UV radiation than the sun, thunderstorms, snow and wind 80 kmh, so outdoor cables must be durable, weather resistant and UV. The cable outdoor freedom must also be capable of withstanding temperature variations during the installation of both wild and throughout his life.
These factors determine the materials used to construct the cable. Various materials are used to map installation environment.
cable jacket to the outside is treated to prevent ultraviolet light penetrating inside the cable and damage to the interior fiberglass. specification of additional UV protection can be specified if necessary.
:: Environment requirement on optical fiber cables within
Cables fiber interior must be strong and flexible to facilitate traction and installation. It must have the NEC requires the fire and smoke. As the practice of industry standard, the jacket is single-mode fiber optic multimode yellow jacket is orange.
:: Materials optical fiber cables Popular cable construction
1. PVC (polyvinyl chloride)
Features:
1) Good resistance to the effects of the environment. Some formulations are designed for -55 ° C to +55 ° C.
2) Good fireproofing. It can be used both indoor and outdoor fiber optic cables.
3) PVC is less flexible than PE (polyethylene)
2. Polyethylene (PE)
Features:
1) outside popular material sheath cables for fiber cables
2) good moisture resistance properties weather
3) Very good insulator
4) Can be very rigid in colder
5) If the appropriate chemical treatment, the EP can be flame retardant
3. Fluoropolymers
Features:
1) good properties and flame resistance
2) properties Low smoke
3) Good flexibility
4) The most commonly used fiber cables for indoor
4. Kevlar (aramid fiber)
son of aramid fiber type material is yellow cable jacket surrounding the fiber. Can also be used as members of the central force.
Features:
1) son of aramid is strong and are used together to protect fiber
2) Kevlar is a brand of aramid son. Kevlar is often used as a reinforcing element in the central fiber cables that are resisting high tensile stress during installation
3) When Kevlar is placed around the inside of the whole cable, which provides additional protection for the fibers of the environment
5. Steel Armor
armor steel jacket is often used in direct burial cables outside and provides excellent resistance to compression and is a true test of rodents. Since steel is a conductor, steel-armored cable to land and loss of fiber optic cable advantages dielectric.
Applications:
1) Direct Burial Outdoor cables
2) The fiber cable used for the industrial environment where the cables are installed without ducts or the protection of the cable tray
Features:
1) It offers excellent resistance to compression direct burial cables external
2) Protect the cables from rodent bite
3) Reduced infiltration of water into the cable fiber fiber extends life expectancy
6. Central Force members
For fiber cables containing a large element the central force is often used. The central force member provides strength and support for the cable. When installing fiber optic cables, the eyes always draw attributable to members of the central force and not the fibers. The firm splicing fiber patch panels and installations, the member of the core wire strength gave members of the anchoring force in the cabinet or patch panel.
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