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How many cameras can be recorded by a NVR is not controlled by the number of camera connections. It is controlled by the bitrate.
The reason could not record at 1080P when more cameras are connected is due to the NVR having a low overall bitrate (incoming bandwidth capacity) of the processor.
An average 1080p camera will use about 5Mbps for 30FPS video, but many NVRs only allow about 2Mbps per camera. Unlike the rest of the industry, our NVRs are built with the latest processors and can do the full 5Mbps per camera.
For example, our 16 channel Networker Pro NVR is rated at a total of 80Mb (5Mbps per camera * 16 cameras = 80Mbps), a lot of lost quality are 32Mb and lower.