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

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Digital Video Recorders (DVR)

Digital video recorders (DVRs) have largely replaced older analog CCTV system equipment such as multiplexers, quads, time-lapse VCRs and videotapes.

A digital video recorder allows live camera images or previously-recorded video images to be viewed on your computer over a computer network or over the Internet. All digital video recorder 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. Digital video recorders for video surveillance are available with 4 to 16 camera inputs.

A DVR can be connected to a CD or DVD burner, computer hard drive, or other mass storage device. PC-based DVRs are also available - these consist of a PCI card that is installed in the computer along with software. DVRs can be set to email you or even call you on your cell phone if a motion is detected.

Other features of a digital video recorder surveillance system include motion sensing, selectable alarm triggers and pan-tilt-zoom camera support. All video, audio, alarm and control signals are sent over the Internet.

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