roam/20211201125733-power_over_ethernet.org

Power Over Ethernet

• Footnotes

Name	IEEE Standard	Maximum PSE Power	PD Available Power
PoE	IEEE 802.3af (Type 1)	15.4 W	12.95 W
PoE+	IEEE 802.3at (Type 2)	30 W	25.50 W
PoE++	IEEE 802.3bt (Type 3)	60 W	51 W
PoE++	IEEE 802.3bt (Type 4)	90 W	71.3 W

Standard Types and Power Levels

Class	Usage	Classification current (mA)	Power range at PD (W)	Max power from PSE (W)
0	Default	0–5	0.44–12.94	15.4
1	Optional	8–13	0.44–3.84	4.00
2	Optional	16–21	3.84–6.49	7.00
3	Optional	25–31	6.49–12.95	15.4
4	Valid for Type 2 (802.3at) devices1	35–45	12.95–25.50	30
5	Valid for Type 3 (802.3bt) devices	36–44 & 1–4	40 (4-pair)	45
6	36–44 & 9–12	51 (4-pair)	60
7	Valid for Type 4 (802.3bt) devices	36–44 & 17–20	62 (4-pair)	75
8	36–44 & 26–30	71.3 (4-pair)	90

PoE Classes

Footnotes

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¹

Class 4 is not allowed for 802.3af devices