Home networking provides three choices for No New Wires physical mediaphone wiring, wireless, and powerline. The powerline is arguably the most difficult medium of these three, but it does have two appealing attributes. No RF conversion hardware is needed, so the cost can be low compared to wireless solutions. More importantly, power outlets are available essentially everywhere someone might want to use a networked device at home. This technical paper describes the powerline as a transmission medium and explains the particulars of PowerPacket, Intellon MAC/PHY OFDM technology.