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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Background
Once Power-on state is achieved, there are two very general systems-level concerns: (a) how to keep the port “alive” (avoid PSE-PD disconnect caused by very small PD loads) and (b) how to protect the cabling infrastructure and PSE/PD from faults such as overloads and short-circuits, yet retain an energy delivery system that is robust enough to provide a normally functioning and healthy PD its usual, momentary bursts of power, just a little above its steady, continuous rating.
The first concern listed above is discussed in the following chapter. The second concern is analyzed in this one.
Historically, the AF standard created a triple-layer cake of sorts: a continuous current region whose upper bound was called ICONT, with an overload ...

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