Applies to:
DL41B/DL81B/DL41A/DL81A/DL41D/DL81D/DH81S/DH81X/DH81NG/DM41D/DM41A/DM81A/DN41D/DN81D/DN41S/DN41NA/DM41H/DM81H/DM21O/DM31O/DE41N/DE81N/DN81NB/DM81Z/DM61W/DG81CP/DG81CQ/DH81NK/DG81CR/DH41NK/DM41G/DN41CJ/DN81BJ/DN61EC/DG81W/DG61X/DG41T/DT81DQ/DT41DC/DT61ER/DG41BE/DG81BE/DN81Q/DN41Q
For instance, the recorder is 720P HD and supports 4 channels, which are channel 1, channel 2, channel 3, channel 4.
Channel 1 and channel 2 are a pair, so do channel 3 and channel 4.
1. If 2 ordinary analog cameras with different resolutions such as 1000TVL and 1200TVL are plugged into channel 1 and channel 2, they work.
2. If 2 HD cameras with different resolutions such as 720P and 960H are plugged into channel 1 and 2, only one can work and the other one can't.
3. If one ordinary analog camera such as 1000TVL and one HD camera 720P are plugged into channel 1 and 2, there is no doubt the 1000TVL camera won't work and 720P camera will work fine.
In conclusion, the 2 cameras plugged into a pair channel such as channel 1 and 2(or channel 3 and 4) should be in same resolution if they are HD cameras. If they are not HD cameras, it doesn't matter.