On the topic of Ethernet this seems to be an interesting product. Read some discussion on CA, seems like it is being used my the same person who designed the LPS-1.
http://www.emosystems.com/product/en-70h...-isolator/
A little bit expensive for me though.
http://www.emosystems.com/product/en-70h...-isolator/
A little bit expensive for me though.