what is CCTV？

  CCTV, Closed Circuit TeleVision, is really a TV system which doesn't broadcast TV signals to public but transmits them over to limited monitor(s). CCTV cameras system usually uses CCD video cameras (to create the video), cable or wireless transceivers or Internet (for video transmission), and monitors (to watch the video). CCTV system is mainly used for surveillance purpose, besides, it can also in other fields like laboratory in schools or in private companies, even the production lines in factories. Along with the usage of CCTV system increased, various CCTV equipment, such as Time Lapse VCRs, combiners, infrared illuminators, Pan/Tilt, are developed. The newest development is web camera server utilizing the web for remote surveillance.