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PowerDsine IEEE802.3 „ 802.3af minimum PSE voltage „ Modular switches, PowerDsine Presentation

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802.3af modular installed base considerations

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 802.3af-chassis

–51V minimum at PSE Æ Boost converter MUST be placed on blade

More power dissipation at blade

More components added to crowded blade

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PowerDsine Presentation

October 2005

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PowerDsine IEEE802.3 „ 802.3af minimum PSE voltage „ Modular switches, 802.3af modular installed base considerations, Page

Contents

Arkadiy Peker Daniel Feldman Yair Darshan Vancouver BC, NovemberIEEE802.3at Task Force Technical Considerations regarding PoEp output voltage range Part APowerDsine Presentation Objectives„ To discuss optimum voltage range for PoEp „ To show advantages of having PoEp minimum voltage ofHP POE voltage range Power dissipation PoEp minimum voltageMaximum power 3.06WPower dissipation Pd powerPSE power PoEp minimum voltageAC input and battery back up AC UPS input „ Let consider different options in PoEp Power architecturesPowerDsine Presentation PoEp minimum voltagePowerDsine Presentation PoEp Power Architecture-AC InputOctober Page„ One of the arguments for not using 51V power supply is that back up battery operates up to ~ 43 PoEp Power Architecture-AC InputHP POE Power Architecture-AC Input PowerDsine Presentation PoEp Power Architecture-AC UPSOctober Page„ 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 44V PS PoEp Power Architecture-AC UPSPOE PS Battery PoEp with Boost circuitPowerDsine Presentation Lb Db Qb RsAC or Battery PoEp with Add PowerAdd Power Circuit POE PS PowerDsine PresentationConclusions Market considerations regarding 802.3at output voltage range Part B802.3af modular installed base considerations „ 802.3af minimum PSE voltage „ Modular switchesPowerDsine Presentation October„ The Conflict is How to solve the conflictPowerDsine Presentation October„ Proposed Solution How to solve the conflict - PD side„ Effects on PSE specifications PoEp PSE minimum voltage is How to solve the conflict - PSE sideSummary PowerDsine Presentation DiscussionOctober PagePowerDsine Presentation ReferencesOctober PagePowerDsine Presentation Annex A Enhanced Classification tableGroup B „ Example for group A and group B „ With Pmax=40W