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[edit | edit source]
| 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[edit | edit source]
- ↑ 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