(Introduction to video monitoring installation and construction common video transmission methods and construction techniques in closed-circuit monitoring system, coaxial cable is the most commonly used medium for transmitting video images. The center of the coaxial cable section is the conductor, which is covered with polyethylene concentric circular insulator, and then the shielding layer of metal braid is outside, and the outermost layer is polyethylene cover. Coaxial cable can shield the external electromagnetic wave and electrostatic field. The larger the cross-sectional area of the conductor, the smaller the transmission loss, and can transmit the video signal for a longer distance.)
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