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Regarding the issue of cable heating, I have a concern about Jo Wallings
analysis. In his supporting document, "walling_2_0905.pdf" the last
sentence in the second paragraph states "...under the assumption that all pairs
in all cables are energized with the same current."
This
is a valid assumption for PoE Plus, since it appears very likely that we'll use
a 4-pair system. But Jo's assumption is invalid for 802.3af since
only half of the pairs are carrying current.
So I
think Jo overestimated the heat dissipation in the cables (for 802.3af) by a
factor of 2.
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