power line Ethernet bridge
A power line Ethernet bridge is a HomePlug device used to extend a LAN into a separate room using the existing electrical system in the building. An Ethernet cable from the network router is plugged into a bridge, which plugs into an AC wall outlet. In a separate room, a second bridge plugs into the wall outlet to provide an Ethernet port for the computer. Power line Ethernet bridges are a type of HomePlug device.
See also HomePlug.