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IEEE802.3 Annex A Enhanced Classification table, Group B, PowerDsine Presentation
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Specification
Install
AC input and battery back up AC UPS input
How to
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Proposed Solution
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Annex A: Enhanced Classification table
Example for group A and group B
With Pmax=40W
Group B
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PowerDsine Presentation
October 2005
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Contents
Vancouver BC, November
IEEE802.3at Task Force
Arkadiy Peker Daniel Feldman Yair Darshan
Part A
Technical Considerations regarding PoEp output voltage range
Objectives
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To discuss optimum voltage range for PoEp
To show advantages of having PoEp minimum voltage of
HP POE voltage range
PoEp minimum voltage
Power dissipation
Maximum power
3.06W
Pd power
Power dissipation
PSE power
PoEp minimum voltage
Let consider different options in PoEp Power architectures
AC input and battery back up AC UPS input
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PoEp minimum voltage
PoEp Power Architecture-AC Input
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PoEp Power Architecture-AC Input
One of the arguments for not using 51V power supply is that back up battery operates up to ~ 43
HP POE Power Architecture-AC Input
PoEp Power Architecture-AC UPS
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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 44V PS
PoEp with Boost circuit
POE PS Battery
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Lb Db Qb Rs
PoEp with Add Power
AC or Battery
Add Power Circuit POE PS
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Conclusions
Part B
Market considerations regarding 802.3at output voltage range
802.3af minimum PSE voltage Modular switches
802.3af modular installed base considerations
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How to solve the conflict
The Conflict is
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How to solve the conflict - PD side
Proposed Solution
How to solve the conflict - PSE side
Effects on PSE specifications PoEp PSE minimum voltage is
Summary
Discussion
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References
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Annex A Enhanced Classification table
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Group B
Example for group A and group B With Pmax=40W