> It's not that much extra area, and it's possible that the PoE chip 
> could be used as the general purpose high-voltage supply input, 
> too. (The PoE spec allows some pretty wide tolerances on the 
> voltage seen at the port). Bear in mind that Ethernet also requires 
> a huge RJ45 socket (which may contain the magnetics & LEDs, but 
> it's still a lot of area. There's also the question of where to put the 
> connector - a perennial problem on Balloon -  which side is a user 
> likely to want pointing out of their case, if any?
> 
Or a header. Its the serial & sb solution we choose so why not for ethernet too?

Nick