802.3af

The original IEEE 802.3af-2003^[1] PoE standard provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA^[2]^[3]) on each port.^[4] Only 12.95 W is assured to be available at the powered device as some power dissipates in the cable.^[5] The updated IEEE 802.3at-2009^[6] PoE standard also known as PoE+ or PoE plus, provides up to 25.5 W of power for "Type 2" devices.^[7] The 2009 standard prohibits a powered device from using all four pairs for power.^[8] Both of these standards have since been incorporated into the IEEE 802.3-2012 publication.^[9]

802.3af 48 volt is used by Ubiquiti UniFi for much of it's hardware.

Pinouts

802.3af Standards A and B from the power sourcing equipment perspective
Pins at switch	T568A color	T568B color	10/100 mode B, DC on spares		10/100 mode A, mixed DC & data		1000 (1 gigabit) mode B, DC & bi-data		1000 (1 gigabit) mode A, DC & bi-data
Pin 1	White/green stripe	White/orange stripe	Rx +		Rx +	DC +	TxRx A +		TxRx A +	DC +
Pin 2	Green solid	Orange solid	Rx −		Rx −	DC +	TxRx A −		TxRx A −	DC +
Pin 3	White/orange stripe	White/green stripe	Tx +		Tx +	DC −	TxRx B +		TxRx B +	DC −
Pin 4	Blue solid	Blue solid		DC +	Unused		TxRx C +	DC +	TxRx C +
Pin 5	White/blue stripe	White/blue stripe		DC +	Unused		TxRx C −	DC +	TxRx C −
Pin 6	Orange solid	Green solid	Tx −		Tx −	DC −	TxRx B −		TxRx B −	DC −
Pin 7	White/brown stripe	White/brown stripe		DC −	Unused		TxRx D +	DC −	TxRx D +
Pin 8	Brown solid	Brown solid		DC −	Unused		TxRx D −	DC −	TxRx D −

References

↑ 802.3af-2003, June 2003
↑ IEEE 802.3-2005, section 2, table 33-5, item 1
↑ IEEE 802.3-2005, section 2, table 33-5, item 4
↑ IEEE 802.3-2005, section 2, table 33-5, item 14
↑ IEEE 802.3-2005, section 2, clause 33.3.5.2
↑ 802.3at Amendment 3: Data Terminal Equipment (DTE) Power via the Media Dependent Interface (MDI) Enhancements, September 11, 2009
↑ "Amendment to IEEE 802.3 Standard Enhances Power Management and Increases Available Power". IEEE. Retrieved 2010-06-24.
↑ Clause 33.3.1 stating, "PDs that simultaneously require power from both Mode A and Mode B are specifically not allowed by this standard."
↑ IEEE 802.3-2012 Standard for Ethernet, IEEE Standards Association, December 28, 2012

[1] 802.3af-2003, June 2003

[2] IEEE 802.3-2005, section 2, table 33-5, item 1

[3] IEEE 802.3-2005, section 2, table 33-5, item 4

[4] IEEE 802.3-2005, section 2, table 33-5, item 14

[5] IEEE 802.3-2005, section 2, clause 33.3.5.2

[6] 802.3at Amendment 3: Data Terminal Equipment (DTE) Power via the Media Dependent Interface (MDI) Enhancements, September 11, 2009

[standards.ieee.org-7] "Amendment to IEEE 802.3 Standard Enhances Power Management and Increases Available Power". IEEE. Retrieved 2010-06-24.

[8] Clause 33.3.1 stating, "PDs that simultaneously require power from both Mode A and Mode B are specifically not allowed by this standard."

[9] IEEE 802.3-2012 Standard for Ethernet, IEEE Standards Association, December 28, 2012

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