A technical outbuilding is located 300m next to the main house. Unfortunately, no ethernet cable or fibre was installed between the two buildings, but a phone line between the two buildings is existing. We investigated several solutions to connect the outbuilding to the main house’s ethernet. There exist several ethernet–2-wire–ethernet bridges, but they cost several hundreds of euros. To maximize the cost-benefit ratio we should get more creative.
A normal power line ethernet adapter modulates its signal on the power line. Can we tap that signal and apply it on a regular 300m long 2-wire phone line?
We bought two power line adapters (technically they are bridges) from MSI: MSI ePower 500HD Kit Home-Plug (500 Mbit/s, 2x Ethernet RJ-45)
For more than several months the hacked power line adaptors have been working very well, and they still do.