I have a WRT54G linksys router. I have it very far away from my internet modem. In the room were the router is there is no UPS (I live in Dominican Republic) so, I have installed this to my UPS and I was able to send the power over the ethernet cable to the router from my room. I you're asking why not to have the router closed to my room it is because the room where the router is now is the central location of my home.