I believe with this type of router it needs an rj45 connection from the pc to make it work not a connection from the set top box. So connect set top box to laptop or pc then with a second rj45 take a patch cable to the router from the laptop or pc. You should then be able to connect other pcs to the router and get them to connect. I used to be with ntl [glad to have moved out of their area] and this was the only way I could get other pcs to connect you will also need to have internet connection sharing enabled on the pc connected to the set top box. This is a main difference between cable modems and adsl.