A friend of mine has a two-storey house and he wired his cameras in using BNC wires/cables. Anyway, fast forward a few years and now he wants to upgrade his CCTV system to the POE/NVR/Blue Iris way of doing things. It's not feasible to replace the BNC cables with Ethernet cables (well, not concealed within the walls). What options does he have if he wants to upgrade his cameras to the POE type? What he suggested to me was that he could use the existing BNC cable to provide power to a camera and the cameras can be wireless, I suppose that is one option.