configure ethernet on tablet

[fcneto]

i´m have a problem to connect my device with ethernet, my tablet is here http://www.androidtablets.net/forum/allwinner-a10-based/35798-need-rom-2-0-3-0-4-0-a.html#post194116, i have a option ethernet and i was try connect with a cable usb/rj45 but noting happen.