PowerDsine IEEE802.3 - Manual (Page 4)

PowerDsine Presentation October 2005 Page 4
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HP POE voltage range
„ Maximum voltage: 57V (safety consideration)
„ What is most optimum value for minimum voltage?
„ PoEp group objective; maximum power within practical limit (Power
Dissipation, Safety consideration)
„ Power dissipation is function of the current
„ Increasing minimum voltage reduces current level for the same load
power or
„ Increasing Power delivery to the load for a given current value.
„ Hence same infrastructure delivers more power to PDs for given
PSE PS size and cost
„ Bottom line: more applications may supported
– Larger POEp market