This does what its meant to do and does it very well .. It will not give you an extra output from your modem, router or hub.. It can however give you an extra port from a faceplate outlet, but it will still use an extra connection at the other end into your router/switch/hub .. Simply put (as best I can) it allows you to have 2 seperate 100mb lan connections running along a single ethernet cable, giving you 2 outputs instead of one, but also requiring 2 inputs from the other end.. Hence why these adaptors have to used in pairs..