|
Everything's right except your assumption "if AC current can only supply 2 A (4 port hub, 500 mA each)...". I'm sorry if I implied that. It's coincidence that the iPAQ AC adapter is rated at output 2A and that a 4-port USB hub is rated at 2A. On the 7-port hubs, the power supply would have to be rated at output of 7*500mA = 3.5A for it to meet the specification of "self-powered".
I think you've got it.
|