> > Use a magjack with POE support, and leave thru-holes or some sort > > of connector/header to add-in a Silvertel POE module. > > i like that idea. do you have any circuits kicking around? This might be a good example: http://arduino.cc/en/Main/ArduinoBoardEthernet Also see http://www.silvertel.com/poe_magnetics.htm Basically, a POE magjack has 4 extra taps that get wired to the 4 inputs of a Silvertel 9205 module, and you get 5v out the other end. Full datasheets are at: http://www.silvertel.com/poe_products.htm http://www.smsc.com/Downloads/SMSC/Downloads_Public/Application_Notes/an1718.pdf The short version: Make sure the Magjack has transient voltage suppression built-in, or that you have some zener diodes on the ethernet phy in case a POE-powered device gets hot-plugged.