I learned very quickly when I got started in wireless that Wi-Fi
junkies love their IEEE standards documentation. As such, I
decided to take a look at some IEEE standards and amendments. To
get started, I downloaded and spent a bit of time reading IEEE
Std 802.3-2008: CSMA/CD and IEEE Std 802.3at-2009. I know what
you're thinking: "What the heck? Those are wired standards, not
wireless!". You are correct. However, the specifications for
Power-over-Ethernet (PoE) and PoE+ can be found within these
documents (Clause 33). A major concern for any wireless project
is always going to be that of powering the access points. Here
is a brief snippet of the information I managed to pull from the
specs: Classification of a Powered Device (PD) Not all devices
require the same amount of power. The Power Source Equipment
(PSE) can try and classify the PD to help manage the available
power and ensure that all devices get only as much power as they
need. There are currently, 5 classes of PDs. level at PSE level
at PSE |0||15.