A recorder's channel count tells you how many cameras fit on it - the range has 4, 8 and 16 channel models. A P in the model code, or a marking such as 8P, means built-in PoE ports, so the cameras take their power from the same network cable and no separate power supplies are needed. For IP cameras an NVR is chosen, while old analogue cabling takes an XVR. Disk space is worked out from the number of cameras and the recording time you want.
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A recorder's channel count tells you how many cameras fit on it - the range has 4, 8 and 16 channel models. A P in the model code, or a marking such as 8P, means built-in PoE ports, so the cameras take their power from the same network cable and no separate power supplies are needed. For IP cameras an NVR is chosen, while old analogue cabling takes an XVR. Disk space is worked out from the number of cameras and the recording time you want.