There are two types of Digital Video recorders
used for CCTV system applications. There is the single channel
device capable of recording a single video signal, which is similar
in function to the conventional VHS VCR.
Secondly there is the digital recorder combined
with a multiplexer, which can record a number of cameras, one
after the other in rapid succession.
Compared to tape based recording, DVRs have
a number of functional and performance benefits:
· Higher Resolution Recordings
· Near instant access to recordings is available
· No loss of image quality when copies or back-ups are
taken
· No wear and tear on recording media unlike conventional
tapes
· They support pre-event recordings, allowing pre-event
recording before an alarm actually appears
· They allow connection to ethernet networks for remote
viewing and playback for instance
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