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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Sample Numerical Calculations for N-Power Delivery
Let us do some simple calculations to illustrate the principles we have learned. Let us stick to single-pair here.
Case 1: No PSE-side current limit, no PD-side UVLO
This would be the maximum theoretical power delivery. Suppose we have 300 m of single-pair CAT3-type cable (AWG 26). We can take the two-pair resistance either as 20 image/100 m, which actually includes patch cables and several contact resistances. Or we can take 15 image/100 m for AWG 26. Let us take the former number just to give us some ...

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