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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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IEEE 802.3at Classification Details Summary
The IEEE 802.3at standard makes several key statements concerning classification. These are summarized and bulleted for easy reference as follows, with bold letter/italics introduced to highlight certain words or phrases
General Points
•  Section 33.2.6 Page 41: With Data Link Layer classification, the PSE and PD communicate using the Data Link Layer Protocol (see 33.6) after the data link is established. The Data Link Layer classification has finer-power resolution and the ability for the PSE and PD to participate in dynamic power allocation wherein allocated power to the PD may change one or more times during PD operation.
•  Section 33.3.5 Page 60: A PD may be classified by the PSE based on the ...

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