Ethernet / USB question

Hello,

Currently I am developing a small server to fetch MJPG images from a
1080p camera and to send them throught the Ethernet port. I'm
discovering that the maximum network throughtput is 50% in a
BeagleBoard XM. Maybe it is a stupid question but only to be
completely sure, Is the Beagleboard Ethernet Port sharing bus with the
USB ports?

Thanks,
Daniel

Yes.

Gerald