hi there,
The AHD DVR can connect AHD camera, 960H and D1 solution camera, for some AHD DVR it has chanel restriction, for example CH1, CH3, CH5,CH7 only can connect AHD camera,CH2,CH4,CH5 can connect AHD, 960H, D1 camera.
In fact it's a waste to connect D1 and 960H camera to AHD DVR.
Hope that can help you.