This paper describes the unique challenges associated with high speed digital communication over existing in-building powerlines. The solutions provided by the 14 Mbps HomePlug 1.0 protocol are described, then an overview of the 200 Mbps HomePlug AV protocol and the frame of Multi-Input Multi-Output (MIMO) Power Line Communication system are given. The last two are providing higher throughput than the HomePlug 1.0.