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[802.3af] POE standards

    I am probably needing redirection, I want to know
if the latest Power over Ethernet standards state
(4,5) and (7,8) pins as the power lines ?
and the voltage over them can range from 44 to 57 volts.
If so is there a 5V switching regulator that can handle 57 volts at
its input?
Please advice
M. Wahab