How to extend a video signal over long distance!! CCTV video transfer using optical fiber!!
Why use fiber optics to transmission CCTV camera video?
The maintenance of picture quality and control data integrity over extended distance:
This is main reason for the use of fiber optic signal strength than loss characteristics of copper cable. In general, the attenuation of coaxial cable to the signal frequency of 5 MHZ, 20 db/km. In mitigation of fiber comparison is 0.3 to 3 db/km mean that fiber optic transmission distance of 60 km and can achieved, depending on exact details of the application. In additional to this low signal loss of fiber frequency range of the signal is very large, so that made optical fiber can be used for transmission of multiple video signals over long distance.
Immunity to electromagnetic interference:
Optical fiber transmits signals as light pulses instead of electrical impulses. This light transmission is not the existence of electromagnetic fields. As fiber transmission leads to applications where connections are used routed away from the power lines and electrical machines. This includes applications such as railways, tramways, electricity generation and vehicles welding machines. In addition to the optical fiber generally as a metal structure there is no problem with ground loops between devices and the cable can be transmitted lighting impulse. This makes the elimination of ground loop fiber optic cable for the medium of choice for strengthening links between the most accessible.
Security of information and operational society:
Unlike copper wire cables with fiber optics do not radiate any signals as a consequence fiber cables are virtually immune from “tapping” so the signal content is difficult to access for unauthorized parties. As there is no emission from optical fiber cable there is no risk that fiber installation will act as a ignition source. This means that fiber can be used explosive atmosphere such as chemical and petro chemical sites providing truly “intrinsic safety” of the transmission path. Note however, that intrinsic safety would not extend to the electro-optic termination modems which would need to be safety certified and protected the same as any other electric equipment.
Efficient use of duct space:
The optical fiber itself is very small, each fiber is only diameter 0.125 mm, protective coating is then applied in stages, depending on demand, making the fiber is cable used. Typically the resulting cable has an appropriate diameter of 3 mm patch lead of heart of 8 mm for single fiber or a fiber of eight for internal or external. In contrast 75 ohm, coaxial cable as a copper – CT100 diameter of 6.5 mm. thus we see the small size of optical fiber to allow significant saving on copper, where space is limited or if duct space is limited. With the small size of fiber weight gain both to achieve the economics of storage of transportation prior to installation.
Multi channel capability and “future proofing”:
While most fibers are now used for CCTV video signal is transmitted and can be data to control signals may wish the user to update the system to support more camera and channels. Each fiber glass can be able to transfer several optical channels, either by using different optical media “colors” i.e division multiplexing wavelength or increase the frequency of the signal with electric multiplexing techniques. The transmission media is so “future proof” and extend the connection should the link for additional devices capacity.
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