Digital Video Recorder (DVR) is a recording unit of video cameras that
normally uses in analog CCTV cameras. DVR will receive analog video
signal from each cameras and then do digitized encoding, compression,
recording process in to internal storage unit or external storage unit.
DVR also service live view, playback, search and export for operator via
front panel control or network connection with remote client software.
Standard DVR can receive video 4ch., 8ch. and max 16 ch model. More
16ch. need to have new DVR unit. Some rarely vendor make 16ch.-32ch.
model.