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The AC adapter is provided with the hub as an option. You don't need it unless the total power consumed is over 500mA. USB powered, the hub provides 500 total. Externally powered, it disconnects the USB source power and provides 3000 total, but still 500 max per port. 500 being the max which is why it can only get that much from the USB port that it's connected to.
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XPort 1.26 -GPS port splitter, logger, and USB device resume fix
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