Instruction/ maintenance manual of the product IEEE802.3 PowerDsine
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www.pow erdsine.com IEEE802.3at Task Force Technical and market considerations regarding PoEp output voltage range Vancouver BC, November 2005 Arkadiy Peker Daniel Feldman Yair Darshan.
www.pow erdsine.com Part A Technical Considerations regarding PoEp output voltage range.
PowerDsine Present ation October 2005 Page 3 www.Power Dsin e.com Objectives To discuss optimum voltage range for PoEp To show advantages of having PoEp minimum voltage of 51V.
PowerDsine Present ation October 2005 Page 4 www.Power Dsin e.com HP POE voltage range Maximum voltage: 57V (safety consideration) What is most optimum value for minimum voltage? PoEp grou.
PowerDsine Present ation October 2005 Page 5 www.Power Dsin e.com PoEp minimum voltage Lets assume current is 0.35A and calculate power delivered to the load by four pairs It means, that at 51V, for the same power dissipation on the cable, power delivered to the load will be 4.
PowerDsine Present ation October 2005 Page 6 www.Power Dsin e.com PoEp minimum voltage Let us look on this issue under anot her angle assume minimum load need to be delivered to PD by four pair is 40W Power dissipation on a cables for 51V PSE will be 2.
PowerDsine Present ation October 2005 Page 7 www.Power Dsin e.com PoEp minimum voltage 51V required smaller PSE power supp ly then at 44V, for the same load. The technical advantage is clear for using higher voltage minimum voltage level for POEp PSE.
PowerDsine Present ation October 2005 Page 8 www.Power Dsin e.com PoEp Power Architecture-AC Input.
PowerDsine Present ation October 2005 Page 9 www.Power Dsin e.com PoEp Power Architecture-AC Input One of the arguments for not using 51V power supply is that back up battery operates up to ~ 43 - 44V.
PowerDsine Present ation October 2005 Page 10 www.Power Dsin e.com HP POE Power Architecture-AC Input Taken at account the voltage drop on a high current battery cable and PSE voltage drop (Mosfet.
PowerDsine Present ation October 2005 Page 11 www.Power Dsin e.com PoEp Power Architecture-AC UPS.
PowerDsine Present ation October 2005 Page 12 www.Power Dsin e.com PoEp Power Architecture-AC UPS Cost of power supply with 44V or 51V outputs is approximately the same.
PowerDsine Present ation October 2005 Page 13 www.Power Dsin e.com PoEp with Boost circuit Battery AC POE PS PWM Rs Lb Qb Db Cb R1 R2.
PowerDsine Present ation October 2005 Page 14 www.Power Dsin e.com PoEp with Add Power Add Power Circuit AC or Battery POE PS + - + - V<51V + - Vout 51V •For 48V 250W power supply, ma ximum power.
PowerDsine Present ation October 2005 Page 15 www.Power Dsin e.com Conclusions Increasing minimum PoEp volta ge from 44V to 51V would increase overall system efficiency Costs of 51V PS and 48V.
www.pow erdsine.com Part B Market considerations regarding 802.3at output voltage range.
PowerDsine Present ation October 2005 Page 17 www.Power Dsin e.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-b lades added to 802.
PowerDsine Present ation October 2005 Page 18 www.Power Dsin e.com How to solve the conflict The Conflict is: – 51V is the Technically pre ferred solution More power at low cost Bigger a.
PowerDsine Present ation October 2005 Page 19 www.Power Dsin e.com How to solve the conflict – PD side Proposed Solution Effects on PD specifications – PD operating voltage range: No effect.
PowerDsine Present ation October 2005 Page 20 www.Power Dsin e.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 aspect, are anyway able to power 802.
PowerDsine Present ation October 2005 Page 21 www.Power Dsin e.com Summary The conflict level is pretty much reduce by the previous recommendations Compliant 802.3at PSE is the one with 51V minimum Physics allow to support most of the higher power classed even with 44V ((enhanced classification part A group).
PowerDsine Present ation October 2005 Page 22 www.Power Dsin e.com Discussion.
PowerDsine Present ation October 2005 Page 23 www.Power Dsin e.com References An Extended Classifi cat ion Proposal-Proposal #1 . Yair Darshan, Vancouver BC, November 2005.
PowerDsine Present ation October 2005 Page 24 www.Power Dsin e.com Annex A: Enhanced Classification table Example for group A and group B With Pmax=40W Group B.
An important point after buying a device PowerDsine IEEE802.3 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought PowerDsine IEEE802.3 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data PowerDsine IEEE802.3 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, PowerDsine IEEE802.3 you will learn all the available features of the product, as well as information on its operation. The information that you get PowerDsine IEEE802.3 will certainly help you make a decision on the purchase.
If you already are a holder of PowerDsine IEEE802.3, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime PowerDsine IEEE802.3.
However, one of the most important roles played by the user manual is to help in solving problems with PowerDsine IEEE802.3. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device PowerDsine IEEE802.3 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
