The principle of operation of an analog video surveillance system is to transmit analog signals of PAL (NTSC) standards coming from video surveillance cameras via a coaxial cable to recording and playback devices.
To transmit analog signals over a twisted pair, you additionally have to use a special video signal receiver-transmitters.
The video signal must be received and processed by some device.
Analog video surveillance systems for these purposes use video input (video capture) boards installed in a PC or video recorders. - The signal transmission distance of a color analog camera is less than that of a black - and-white one.
The number of signal processing channels of these devices can vary from 1 to 32-64 (maximum).
Despite the obsolescence, analog video surveillance has a number of advantages:
- Low cost
- High level of compatibility of products from different manufacturers with each other
- Easy selection of equipment and technological solutions
- The focus of some installers is on analog systems.