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IEEE802.3 manual Part A, Technical Considerations regarding PoEp output voltage range
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IEEE802.3
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Specifications
Install
AC input and battery back up AC UPS input
How to
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Proposed Solution
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Part A
Technical Considerations regarding
PoEp output voltage range
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Contents
Arkadiy Peker Daniel Feldman Yair Darshan
Vancouver BC, November
IEEE802.3at Task Force
Part A
Technical Considerations regarding PoEp output voltage range
To discuss optimum voltage range for PoEp
Objectives
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To show advantages of having PoEp minimum voltage of
HP POE voltage range
Maximum power
PoEp minimum voltage
Power dissipation
3.06W
PSE power
Pd power
Power dissipation
PoEp minimum voltage
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Let consider different options in PoEp Power architectures
AC input and battery back up AC UPS input
PoEp minimum voltage
October
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
October
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
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PoEp with Boost circuit
POE PS Battery
Lb Db Qb Rs
Add Power Circuit POE PS
PoEp with Add Power
AC or Battery
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Conclusions
Part B
Market considerations regarding 802.3at output voltage range
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802.3af minimum PSE voltage Modular switches
802.3af modular installed base considerations
October
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How to solve the conflict
The Conflict is
October
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
October
Discussion
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October
References
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Group B
Annex A Enhanced Classification table
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Example for group A and group B With Pmax=40W