RTFC11: how to power with PoE 802.11at/af?

Only to keep things as together as possible:
http://forum.mikrotik.com/t/rbftc11-crossover-cable-to-power-from-802-3at-poe-half-crossed-or-fully-crossed/165256/1

It seems like “cross” translated from Mikrotikish means crossover (maybe).