The HD-QuadBrid Series Dvr is an Analog/HD-Hybrid Model that can support Analog, TVI, AHD & IP cameras. Through coaxial cable, the video transmission distance can reach up to 300~500 meters without obvious video quality loss. In addition, the HD Quadbrid DVR can transmit CVBS 75Ohm analog video signals with a resolution of 720P and 1080P at 30fps, which are difficult tasks to adopt with other HD coaxial solutions. Merely replacing the existing analog camera with the latest HD-TVI cameras users can upgrade their surveillance system to a brand new 1080P HD system, which doesn't require any extra installation knowledge or cost of Proprietary Dvr's.
See comparisons of TVI to Analog, CVI, SDI, and IP technologies here.