PowerDsine IEEE802.3 - Manual (Page 20)

PowerDsine Presentation October 2005 Page 20
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How to solve the conflict – PSE side
„ Effects on PSE specifications
– PoEp PSE minimum voltage is 51V.
– However PSE's that have a 44V minimum output and are 802.3at-
complaint in any other aspect, are anyway able to power 802.3at-
complaint PD's with classes of Part (a). (Hence all OK so far..)
– Supplies power only if capable of (Like we do today in
IEEE802.3af)
– 802.3af PSE classification including class 4 should be mandatory
(In order to PSE to know if to power or not)
„ To differentiate between 802.3af PD and PoEp PD.
– 802.3at PSE extended classification is optional.
„ Like classification is currently optional in 802.3af