DVR Server Manual
117
To NV 42 series card, there is no need to connect the “audio in” and “audio
out” cable. However, a sound pick-up is necessary if you want to hear and
record the sound, no matter what’s the type of the card.
DG Series Card Audio Preview
The connection is same as NV 40 series card.
To audio preview and record of IP cameras, please refer to page 76.