Ethernet over Power also called Power-line Communication allows Ethernet signals to be sent over standard electrical power wiring in a building. This is helpful for situations where both WiFi and running new Ethernet cabling is not supported. Usually this is done by using adapters that plug into a wall power outlet and have a RJ-45 socket. It is often confused with Power over Ethernet, which is using Ethernet signals to power a networking device.
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What is Ethernet over Power, and how does it work?
What is the difference between Ethernet over Power and Power over Ethernet?
What are the advantages and limitations of using Ethernet over Power?