8 pin RJ45 (8P8C) female connector at
the hub.
8 pin RJ45 (8P8C) male connector at
the cable.
Power over Ethernet (PoE) is a technology, described by IEEE 802.3af standard, that allows IP telephones, wireless LAN Access Points, Security network cameras and other IP-based terminals to receive power, in parallel to data, over the existing CAT-5 Ethernet infrastructure without the need to make any modifications in it.
PoE integrates data and power on the same wires, it keeps the structured cabling safe and does not interfere with concurrent network operation. PoE delivers 48v of DC power over unshielded twisted-pair wiring for terminals consuming less than 13 watts of power.
| Pin | Alternative A | Alternative B |
|---|---|---|
| 1 | Vport Positive | |
| 2 | Vport Positive | |
| 3 | Vport Negative | |
| 4 | Vport Positive | |
| 5 | Vport Positive | |
| 6 | Vport Negative | |
| 7 | Vport Negative | |
| 8 | Vport Negative |
POE pinouts from different manufacturers
| STANDARD | SOURCE | LOAD | REMARKS |
|---|---|---|---|
| Ethernet RJ-45 connector pin number | |||
| Source Voltage | 1 | 2 | 3 |
| IEEE 802.3af using data pairs |
48 V DC, protected | RX, DC+ | RX, DC+ |
| IEEE 802.3af using spare pairs |
48 V DC, protected | RX | RX |
| Intel, Symbol, Orinoco | Usually 12 or 24 V DC |
RX | RX |
| Cisco (OLD old standard) |
48 V DC | RX | RX |
| Cisco (NEW old standard) |
48 V DC | RX | RX |
| D-Link (Adapter) | 48 V DC | RX | RX |
| Apple MacIntosh AirPort PoE, Extreme | 48 V DC | RX | RX |
| HyperLink | Many DC Voltages Available | RX | RX |
| NYC Wireless “Roll Your Own” |
12 or 24 or 48 V DC | RX | RX |
PoE - powered devices should obey following specifications:
| Parameter | Min | Max |
|---|---|---|
| Signature Resistance, KOhm | 23.75 | 26.25 |
| Startup Time (till I>10mA), ms | 300 | |
| Power Consumption, W | 12.95 | |
| Operating Input Voltage Range, V | 36 | 57 |
| Must Turn on Voltage, V | 44 | |
| Must Turn off Voltage, V | 30 V | |
| Input Current (@36Vdc), mA | 10 | 350 |
| Input Current, Peak, mA | 400 |