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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Plotting Power Delivery Curves over Long Distances
Finally, we plot out both solutions of power delivery for various cases. In Fig. 13.9, we have the solutions for two-pair operating using CAT3. In Fig. 13.10, we have the solutions for two-pair operating using CAT5e. In Fig. 13.11, we have the solutions for four-pair operating using CAT5e. In Fig. 13.12, we have the solutions for one-pair operating using CAT3. Note that in each case, on the lower side we have a dark-gray highlighted region. This corresponds to existing equipment (with appropriate “safe” current limiting and a average UVLO of 36 V). Right above it is a region in light gray that shows how the power-delivery region expands just by allowing the UVLO to go to 25 V. There is no compromise ...

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