Are the USB/Firewire ports powered?

I have an external hard drive that is powered by the USB of my powerbook- and I noticed that the 20" display features usb and firewire ports.
Are they self powered? (the spare ports on the apple keyboard are not- i.e. yu can't charge ipod from them)
Any advice is appreciated
Thank you

The official specifications say:
<< Two-port, self-powered USB 2.0 hub, two FireWire 400 ports and Kensington security port >>
So the USB hub should be self-powered. However, from my experience, connecting the iPod (or any other bus-powered USB device) to the display doesnot work as expected.
Maybe it's because I have all four ports (USB and FW400) occupied, and one of the FW devices is also bus-powered.

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