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"The resolution at which a given digital video recorder (DVR) records video feeds is determined by two factors: the nature of the cameras in your surveillance system, and the capabilities (and self-selected settings) of your DVR.\n\n\n\nAnalog video technology means cameras can deliver resolutions up to 1000 TVL (Television Lines). And some digital HD SDI cameras from Q-See are capable of recording in 720p and 1080p high definition. We even carry digital cameras with superior 4MP resolution. This provides the benefit of higher pixel counts combined with no loss of clarity due to the need to convert video signals from analog to digital formats.\n\nDVR Compatibility\nIt\u2019s important to understand that your DVR, regardless of its recording resolution, may only work with the specific types of cameras it came bundled with. Although they use similar (BNC) connectors, conventional analog cameras and newer HD SDI cameras are incompatible\u2014not interchangeable\u2014technologies. Be sure your DVR and cameras are compatible before buying.\n\nOlder, conventional DVRs can only record files up to the D1 (704x480 pixels) or 960H formats (960x480 pixels). In contrast, more sophisticated HD SDI systems will record in formats up to 1080p (1920x1080 pixels), or full HD. Consider adding an external hard drive for expanded, removable storage."^^<http://www.w3.org/2001/XMLSchema#string>
<https://q-see.com/blogs/q-see/determining-dvr-recorder-resolution>