PSN / Router trouble?

So me and my roomates are failing at understanding technology. Purchased a Belkin N Router for not just internet but also to hook up our gaming equipment. We set up the network, can log on to the comps just fine, but when we input the same data into the PS3's network setup to test the connection, it fails to connect to the PSN server.

Does anyone else have these problems and can offer knowledge wise to a group of gamers?