Security Cameras 101 -- Info Guide to Security Cams, CCTV & Video Surveillance

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CCTV Multiplexers & Quads

Multiplexers are found in analog closed-circuit television (CCTV) video surveillance systems and are used to view images from multiple security cameras on a single monitor. Multiplexers are available with 4, 8, or 16 video inputs. When using a multiplexer you are also able to record cameras images while viewing any combination of images from different cameras.

Images can be stored on a time-lapse VCR for later viewing. You can also see the images from each camera individually in any sequence, or time interval desired. Most CCTV equipment can be setup to record only images where motion is detected on the camera field of view. This saves you from having to play back hours of video footage that doesn't change. A Quad is another name for a multiplexer with 4 video inputs.

Other features of an analog CCTV surveillance system include motion sensing, selectable alarm triggers and pan-tilt-zoom camera support. All video, audio, alarm and control signals are sent over eith coaxial cable or via phone lines in some systems.

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