Want secure network connectivity on your European wired house? The Level One European Homeplug connects to European plugs and uses the power grid to provide 85 mbps network LAN support.
How it Works:
The Homeplug is very easy to use. Plug the adapter into the wall and use a regular RJ-45 ethernet cable to connect to your network gateway/router. Now, in each room that you need a network connection, plug in another ethernet bridge. Assuming you have a decent power grid, the homeplug will provide 85 mbps speed for the LAN, which is just slightly slower than houses actually wired for networking.
Keep in mind that this homeplug is made specifically for European plugs. There is no problem with voltage, so if you needed to use a passive voltage adapter it should still work on US plugs.