What is the difference between PoE, PoE+, and PoE++/bt?
They denote increasing per-port power classes (af/at/bt). Always check both class and total budget on the switch record.
Related: Buying guides, RFQ.
FAQ: Poe
How many PoE devices can a PoE switch support?
Divide the published system PoE budget by per-device class draw, then leave headroom. Port count alone is not the limit. Start from PoE category models such as C9500-24X.
Related: Buying guides, RFQ.