[graton]

They are the lowest power way to connect SFP. And they are cheap.

Though I'm not sure I would pull them as they tend to max out at around 6-7 meters. I use them to connect systems within the same rack/room.

[mmastrac]

Floor to floor in a house isn't too bad with 6-7m, but I suppose there's always the AOC cables that are 20m+.