I connected this switch on port 1 output from an old box that was not the router. Then I plugged my 2 PC case CPL on ports 2 and 3 without installing anything. It has an installation CD, but I did not want to bother with that. And it works perfectly, without any slowdown, I can go on the net without any worries. Of course this unit must be powered on the sector. Branch and it is working!