I don't want to trash your post, but do not buy this modem! 3Com offers no virtually no support for this modem since the have discontinued their cable modem products.
I bought one of these at Fry's a month ago. It didn't even work. I tried for a whole week to get it up and running but no cigar.
They are discontinued piece of craps. Thats why they are so cheap...
any ways, go to new egg and get the TOSHIBA PCX1100U DOCSIS CABLE MODEM WITH USB - RETAIL
The best cable modem out there and its $116.
a bit more expensive but you get what you pay for.