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[ May 18, 2008 ]

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High PoE made simple

According to National Semiconductor's Grant Smith, high Power-over-Ethernet (HPoE) standards are still to be resolved. What is expected by most is that the voltage source will be increased to 53Vdc, usable current from each line to about 750mA, and the total resistance in the cable be limited below 12.5Ω. But for some applications, this is not enough power. One solution is to use multiple Ethernet lines, but this raises the problem of power sharing.

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