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When a channel is added with device but it is not enable, you will see as below:
Remark: when the current resolution is over the max resolution that the channel supported,
then a red “X” will be shown on the preview image, for example: Under full digital
channel mode, Max resolution of channel 3 is D1, if it was connected to a device with
resolution over D1 ( such as 960H), you will see below pic:
Channel mode: