While not an officially supported solution, and you'll have to revert back to the original, unextended, cables for any support if you start having problems, yes, you can extend the cables with a normal Cat6 cable and an HDMI extension cable. You may find though that there is too much voltage drop to power the camera for longer distances. If this is the case for your installation, you will need to use an external power supply for the camera. It's also recommended if using an external power supply that you don't connect the power conductors in the control cable.
See this thread for some examples of other people who have extended the HDMI and control cables.
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These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...