Fiber Optics. Technican's Manual by Jim Hayes

By Jim Hayes

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6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. Long-term use load Vertical rise distance Flame resistance UV stability or UV resistance Resistance to damage from rodents Resistance to damage from water Crush loads Resistance to conduction under high voltage fields Toxicity High flexibility/static versus dynamic applications Abrasion resistance Resistance to solvents, petrochemicals, and other chemicals Hermetically sealed fiber Radiation resistance Impact resistance Gas permeability Stability of filling compounds Vibration Temperature Range of Operation The temperature range of operation is the temperature range within which the attenuation remains less than the specified value.

By simply converting the signal from electrical to optical, the advantages of fiber optics became cost-effective. Now CATV has adopted a network architecture (Figure 3-2) that overbuilds the normal coax network with fiber optic links. 34 CHAPTER 3 — FIBER OPTIC NETWORKS Coax Network Headend Fiber Overbuild Headend Figure 3-2 CATV architectures before and after fiber overbuild. Fiber is easy to install in an overbuild, either by lashing lightweight fiber optic cable to the installed aerial coax or by pulling in underground ducts.

Vertical Installations Optical fibers in any type of vertical tray, raceway, or shaft should be clamped at frequent intervals, so that the entire weight of the cable is not supported at the top. The weight of the cable should be evenly supported over its entire length. Clamping intervals may vary from between 3 feet for outdoor installations with wind stress problems to 50 feet for indoor installations. In such instances, the fibers sometimes have a tendency to migrate downward, especially in cold weather, which causes a signal loss (attenuation).

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