PowerDsine IEEE802.3 Owner's Manual

15, PowerDsine Presentation October 2005 Page 15 www.PowerDsine.com 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…

12, PowerDsine IEEE802.3 PowerDsine Presentation October 2005 Page 12 www.PowerDsine.com PoEp Power Architecture-AC UPS  Cost of power supply with 44V or 51V outputs is approximately the same. But under the same conditions, 51V output power supply will have higher efficiency then 4…

10, PowerDsine Presentation October 2005 Page 10 www.PowerDsine.com HP POE Power Architecture-AC Input  Taken at account the voltage drop on a high current battery cable and PSE voltage drop (Mosfet and CS resistor), it would require Low Voltage Disconnect…

20, PowerDsine Presentation October 2005 Page 20 www.PowerDsine.com 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…

17, PowerDsine Presentation October 2005 Page 17 www.PowerDsine.com 802.3af modular installed base considerations  802.3af minimum PSE voltage: 44V  Modular switches – 44V power supply is deployed with chassis – Customer expectation: 802.3at-blades added to 802.3…

14, PowerDsine Presentation October 2005 Page 14 www.PowerDsine.com PoEp with Add Power Add Power Circuit AC or Battery POE PS + - + - V<51V + - Vout 51V •For 48V 250W power supply, maximum power for add power converter would be (52V-48V)*(500/48)=42W or …