IEEE 802.3bt, ratified in September 2018 and marketed as PoE++ or 4PPoE, delivers up to 90 watts from the switch port and about 71 watts to the connected device using all four pairs of an Ethernet cable. Backward compatible with 802.3af and 802.3at, it made full-power commercial PoE lighting practical.
802.3bt uses all four pairs of the Ethernet cable, cutting heat and resistive loss versus two-pair delivery. Detection and classification negotiation protects legacy devices, and the 100 m channel limit still governs runs.
Specify Cat6/Cat6a for dense bundles; '100W' is marketing rounding, not the standard.
We advise before we quote. Tell us what you are working on and we will tell you whether this applies to your project.
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