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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Peak Power Calculations
Peak power and overload are better defined by the AT standard. We need to understand this issue further now.
First, from the viewpoint of the PD: The peak value expresses a certain overload percentage margin above ICONT. It is also based on fairly arbitrary percentages. For Type 2, it allows the PD to demand 11 percent higher power than its continuous value—taking it from a continuous value of 25.5 W to a peak of 28.3 W (temporarily). This value was used in a preceding bullet. For Type 1, Class 0/3, this overload margin is set somewhat arbitrarily at 11.2 percent, taking it from a continuous value of 12.95 W to a peak of 14.4 W. The AT standard rounded up 12.95 to 13 W. Based on that, the overload margin is slightly ...

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