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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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The Recommended Operating Templates Collected and Explained
In Figs. 6.3 to 6.5 we have finally collected the Type 1 “minimum” operating templates at different voltages: 44 V, 50 V, 57 V, based on our discussions surrounding Fig. 6.2. Figure 6.4 is based on the increasingly common port voltage setting of 50 V, which is used by most AC-DC power supply manufacturers today, to cater to both Type 1 and Type 2 PSEs (they set about 52.5 V as the nominal output, which accounts for the output-rail tolerances and also the drop across the pass-FET of the PSE). These Type 1 templates are essentially an intersection of AF and Type 1 AT requirements. They will help pass an AF compliance test more readily, besides passing an AT Type 1 compliance test.

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