The channel count — 4, 8 or 16 — sets how many cameras can be connected to the unit, and that is usually where the choice starts. The second designation that matters is PoE: on models carrying the letter P or the markings 8P and 16P, the cameras draw power over the same network cable, so separate power supplies are not needed. The NVR series is meant for IP cameras, while analogue and mixed systems call for XVR Pentabrid recorders.
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The channel count — 4, 8 or 16 — sets how many cameras can be connected to the unit, and that is usually where the choice starts. The second designation that matters is PoE: on models carrying the letter P or the markings 8P and 16P, the cameras draw power over the same network cable, so separate power supplies are not needed. The NVR series is meant for IP cameras, while analogue and mixed systems call for XVR Pentabrid recorders.