RAS vis-à-vis the switch itself: it works automatically, simply connect ethernet cables & food! Some notes on this switch: - The power cable has a switch to turn off the switch - 5 ports are available in total, so you can plug that 4 PC by connecting the other port to the Internet box, but that is the case on most models of this type - The housing is really small, with good finishes Only drawback: no wall mount is provided on the back!