PoE Knoweldge capture

Knowledge capture for PoE (Power over Ethernet). Thanks to Satsh for inspiring this cheatsheet:

Cheatsheet

PoE = 802.3af	The original IEEE 802.3af-2003 PoE standard provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA) on each port.
PoE+ = 802.3at	The updated IEEE 802.3at-2009 PoE standard also known as PoE+ or PoE plus, provides up to 25.5 W of power for Type 2 devices.
PoE++ = 802.3.bt	The IEEE 802.3bt-2018 standard also known as PoE++ or 4PPoE. The standard introduces two additional power types: up to 51 W delivered power (Type 3) and up to 71.3 W delivered power (Type 4). Each pair of twisted pairs needs to handle a current of up to 600 mA (Type 3) or 960 mA (Type 4). Additionally, support for 2.5GBASE-T, 5GBASE-T and 10GBASE-T is included.

 

PoE devices reference

Ubiquiti UAP-AC-PRO (predecessor to the U6-Pro)	802.3af PoE / 802.3at PoE+ Maximum Power Consumption9W / Supported voltage range 44—57V DC Includes secondary 1GbE port
Ubiquiti U6-Pro	802.3at PoE+ Max. power consumption13W / Supported voltage range 44—57V DC Requires: 48V, 0.5A PoE adapter
Ubiquiti U6-Lite	802.3af PoE Max. power consumption 12W / Supported voltage range 44—57V DC Requires: 48V, 0.32A PoE adapter

Here is a copy+paste from Wikipedia:

Comparison of PoE parameters

Property	802.3af (802.3at Type 1), PoE	802.3at Type 2, PoE+	802.3bt Type 3, 4PPoE or PoE++	802.3bt Type 4, 4PPoE or PoE++
Power available at PD	12.95 W	25.50 W	51 W	71.3 W
Maximum power delivered by PSE	15.40 W	30.0 W	60 W	100 W
Voltage range (at PSE)	44.0–57.0 V	50.0–57.0 V	50.0–57.0 V	52.0–57.0 V
Voltage range (at PD)	37.0–57.0 V	42.5–57.0 V	42.5–57.0 V	41.1–57.0 V
Maximum current Imax	350 mA	600 mA	600 mA per pair	960 mA per pair
Maximum cable resistance per pairset	20 Ω (Category 3)	12.5 Ω (Category 5)	12.5 Ω	12.5 Ω
Power management	Three power class levels (1-3) negotiated by signature	Four power class levels (1-4) negotiated by signature or 0.1 W steps negotiated by LLDP	Six power class levels (1-6) negotiated by signature or 0.1 W steps negotiated by LLDP	Eight power class levels (1-8) negotiated by signature or 0.1 W steps negotiated by LLDP
Derating of maximum cable ambient operating temperature	None	5 °C (9 °F) with one mode (two pairs) active	10 °C (20 °F) with more than half of bundled cables pairs at Imax	10 °C (20 °F) with temperature planning required
Supported cabling	Category 3 and Category 5	Category 5	Category 5	Category 5
Supported modes	Mode A (endspan), Mode B (midspan)	Mode A, Mode B	Mode A, Mode B, 4-pair Mode	4-pair Mode Mandatory

citation:

Props to:
Satsh @ Ubiquiti (UI) Community
Wikipeida editors @ https://en.wikipedia.org/wiki/Power_over_Ethernet