ifconfig rausb0 up
although it should detect it even if the interface is down its worth a try
ive used the same adapter (i still am using it) and it worked right out of the box with absolutely no problems whatso ever
btw is ure broadcom one built in? if so it could be that your USB Hub on ure mobo isnt being detected. what chipset is your motherboard? look for any special drivers for your motherboard and install them. I remember when i was using SuSe my network card wasnt being detected cos the motherboard wasnt being identified properly.