Ethernet Over Powerlines

Please anybody in the house with useful info on the topic "Ethernet Over Powerlines" as I intend to cover this area in my final year project. I badly need a circuit diagram of the adapter used for an in-home connection. Searched the length and breath of the net, all to no avail.
Somebody please help a brother.
links would be richly appreciated.

I just hope this helps u. I have so mcuh links on this topic but its all in German. But here are some pics to give u hints on how it works. The Current circuit in your house has to be in parallel connection before it works.