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Coaxial cable has been the standard of video transmission for years. It consists of a conductor (usually bare copper) surrounded by a polyethylene dielectric. Coax is shielded with a metal braid and/or foil to protect against electromagnetic interference (EMI). Coax is a popular and proven technology. Because almost all CCTV cameras and monitors accept coax connections, no media conversion is required. Coax's low attenuation and resistance to EMI makes it an excellent choice for transmission distances of as long as 1500 feet (and longer if repeaters are used). Both inbound video and outbound PTZ (Pan, Tilt, and Zoom) commands can travel over the same cable.
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