Samsung Digital Video Recorder SVR-1660C - Manual (Page 56)

Install Manual
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[AVI Copy]
Some USB storage devices may require additional software and drivers. Care
should be taken in these cases as the DVR may not recognize some USB
products like this. If copied files do not playback on another computer, double
check that proper playback software and codecs are installed.
3.3.3.7 Video in/out connections
The DVR video input/output are “Loop through" and detect connection status automatically to
set terminal resistance.
For example, when only video input is connected, terminal resistance is internally set to 75Ω.
However, when video input and output are connected, terminal resistance is set to Hi-Z. As such,
when input and output are connected, the external output device should have its resistance set
to 75Ω.