HD DVR Recorders normally receive their signal transmission over Coax cable such as RG59 or RG6. HD DVRs use one of several different types of transmission. There is HD-CVI, HD-TVI, AHD and Analog CCTV. There is very little difference between the 3 different HD transmission technologies however it is important to note that both the cameras and the recorder must use the same technology to function correctly.
Almost all of our HD DVRs can work with any of the 4 technologies now we have grouped all compatible equipment on our website to make it easier to select the right products. Also, almost all of our HD DVR recorders accept at least some IP camera transmission over the network. So this means that in most cases you can combine older analog technology, IP cameras and HD over coax cameras in a single system.
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