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not sure about the distance but I would say a combination of both. power will drop and the data will be messed up.
6 ports!!!! you have nothing to worry about.
run the 1.1 devices off a single powered hub.
Then run the DVd drive off a usb2 port (powered by the opus - you can splice into the USB cable at the PC end or run a cable up).
Then hub the webcams off another powered hub.
then run the other stuff off another powered hub.
You may be able to combine the latter 2 hubs into one but look for some cheap hubs. that uses 4 ports and leaves you 2 for other devices neat the Pc you might add - eg wifi or bluetooth.
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or skiing or diving or doing somthing else fun!
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