February 2013
Intermediate to advanced
480 pages
13h 35m
English
Content preview from Power Over Ethernet Interoperability GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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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