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Sorry to trouble you with a trivial issue - just trying to help:
Paragraph 13.4.1 introduces the term "network interface device (NID)" - I assume from the context that an NID is what we might commonly refer to as a hub, but I can see no formal definition of NID in the definitions section (1.4) of the 802.3af spec or the full 802.3 spec, nor does it feature in the diagrams of sections 33.1 or 33.2. Is NID worthy of a formal definition?
On closer reading of 220.127.116.11.1 - this refers to "Equipment [presumably NIDs?] containing multiple instances of PSE and/or PD..." - I am trying unsuccessfully to envisage a piece of equipment with multiple PDs, or a mixture of PSEs and PDs, but if such equipment could exist, and if it is an NID, then I am more unclear about what the term "NID" actually covers.
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