OK it's a slow day, I should be working but all i have left to do it open a 4000 line file and add some screens and searchbot activity reporting (fucking boring work) so I read a bit on the user guide about this "router." Seems like a nifty little low-cost item.
Buy the hub, couple of cables and plug it in. The thing comes configured to hand out enough addresses (32) for your network. I doubt seriously if the folks at TT&T disabled this. They would setup the connect out portion for you and leave the rest alone. So it should be plug and go type thing.
USUALLY your machine will be configed to get it's addess from a DHCP server and your zyxel serves that purpose; if you're connecting now, odds are all is right with the world.