I've have an NVR 7604NI-K1-4P(B).
On which i've selected timechecks via NTP.
The camera's attached to the NVR get their own IP address 192.168.254.4/3/2. (3 cams total attached)
I'm not sure how to take care of the time-settings on the camera's as it seems that they are not able to "test"...