[8023-POEP] Backward Compatible Enhanced Class Rev 2

[Christian BEIA <christian.beia@xxxxxx>]

Hi all,
I made some little modifications to my classification proposal in order to have 36 classes.

In the attached document the modifications are in green

This scheme uses 4 ping-pong cycles (fingers) but needs only 3 pins. 
I propose to define 9 sub-classes for each .af class and 9 classes in the new range from 12.95 to xx W. (36 classes total)

Cycle One: Macro-Classes definition
•	Classes 1 to 3 cover .af power range
	o	.af PSE classifies .at PD under 13W properly
•	Class 4 covers 12.95W to xx power range

Cycle two: .at classification signature
•	.at PD sinks
	o	class1 current if it’s a > 6.49W PD (classes 3 or 4 on Cycle1)
	o	class4 current if it’s a <6.49W PD  (classes 1 or 2 on Cycle2)
•	no potential false .at PD indication, because Cycle2 current is different from Cycle1)
•	Fixed current, no pin needed.

Cycles three and four: class refining
•	Use only 3 classes: Class1 to Class3 to divide each class into 3 sub-classes (cycle 3) and each sub-class into 3 sub-sub-classes (cycle4).
•	No potential heating of the system
•	4x3x3= 36 classes 
•	No avoided class codes.
•	If the PSE doesn’t perform 4 class cycles, it is a .af PSE

Backward Compatible Enhanced Class Rev 2.doc