802.3af

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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 Pair 3 Tip
White/green stripe
Pair 2 Tip
White/orange stripe
Rx + Rx + DC + TxRx A + TxRx A + DC +
Pin 2 Pair 3 Ring
Green solid
Pair 2 Ring
Orange solid
Rx − Rx − DC + TxRx A − TxRx A − DC +
Pin 3 Pair 2 Tip
White/orange stripe
Pair 3 Tip
White/green stripe
Tx + Tx + DC − TxRx B + TxRx B + DC −
Pin 4 Pair 1 Ring
Blue solid
Pair 1 Ring
Blue solid
DC + Unused TxRx C + DC + TxRx C +
Pin 5 Pair 1 Tip
White/blue stripe
Pair 1 Tip
White/blue stripe
DC + Unused TxRx C − DC + TxRx C −
Pin 6 Pair 2 Ring
Orange solid
Pair 3 Ring
Green solid
Tx − Tx − DC − TxRx B − TxRx B − DC −
Pin 7 Pair 4 Tip
White/brown stripe
Pair 4 Tip
White/brown stripe
DC − Unused TxRx D + DC − TxRx D +
Pin 8 Pair 4 Ring
Brown solid
Pair 4 Ring
Brown solid
DC − Unused TxRx D − DC − TxRx D −

References

  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 
  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