Networking through power lines

If wiring your home is too expensive, you can attach something to your power socket and attach a ethernet port to your router, and do the same thing to your PC, and it acts that you wired in your home
A typical house has some power sockets in each room and you would usually keep a computer near a electric socket so you can free a electric socket for the powerline networking adapter.
The advantages are:

• Cheap
• Uses electrical wiring in your home
• Easy to Install
• Fast. Starts at 14MBPs and some more expensive kits can go up to 1000MBPs
• Networked printers does not have to be near a computer
• Can work at WiFi dead spots at your home
• Doesn’t add costs to your electrical bill

But the signal can get into other people’s home but people can’t encode it unlike WiFi.

Two companies make these chips. Intellon and Intelogis.
Intellon’s PowerPacket technology which serves as the basis of HomePlug Powerline Alliance standard uses a enhanced form of OFDM (orthogonal frequency division multiplexing) which is a variation of of the FDM (frequency division multiplexing) used in phone line networking.
Intelogis uses FSK (frequency shift keying) to send data back and forth in your home. One for 1s and one for 0s to send information between the computers on the network. They are used in a narrow band just above the level where the most line noise occurs.
You can use this aside of HomePNA and the popular Wifi solutions without discarding them. But don’t use a surge protector or you will damage them.
Note: For information on installing this technology, wait around new years eve of this year