PowerDsine IEEE802.3 - Manual (Page 15)

PowerDsine Presentation October 2005 Page 15
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Conclusions
„ Increasing minimum PoEp voltage from 44V to 51V would
increase overall system efficiency
„ Costs of 51V PS and 48V PS are approximately the same and
from technical point of view would be beneficial to have minimum
51V in PoEp PSE
„ Regardless of output voltage consideration, adding boost circuit for
system with batteries back up, would increase battery useful life in
POE systems