In a nutshell, it consists of front end, transmission and terminal.
(1) front end: used to obtain the image of the monitored area.
Generally consists of camera and lens, cloud platform, encoder, dustproof cover and so on.
(2) transmission: it is used to feed video (sometimes including audio) signal output from the camera to the central computer room or other monitoring points.
It is usually composed of feeder, video cable compensator and video amplifier.
(3) terminal: it is used to display and record, video processing, output control signals, and receive signals from the front end.
Generally including monitors, various control equipment, and recording equipment, etc.