I would like to know in the event I need to add a more robust dc supply
The barrel size for our USB3-HUB10C2 is 5.5mm (-) / 2.0mm (+).
We have not verified operation of the hub when pulling more than 48w of current through it. While you will certainly be able to connect a more powerful power supply, the hub’s internal circuitry may not be able to handle the additional current and could fail, potentially catastrophically, so we do need to advise caution.
If you need a hub that is rated for more power, we do have a 60 watt 7-port USB 3.0 hub available: http://plugable.com/products/usb3-hub7bc
Thanks for the information it is very useful.