This is not an Eagle-specific question, but I need to do a short run
of traces between two USB connectors on a board, connecting a USB host
with a USB slave. I have never laid out USB signals before and I am a
little nervous about how to do it. Must I treat the data lines as RF
transmission lines? What trace width and spacing should I use? Can I
use vias? What trace thickness should I use? The traces joining the
two recepticals are only going to be about 2 inches long. How
critical is USB layout anyway?