Power over Ethernet is a technology 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. Described by IEEE 802.3af standard.
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 | 4 | 5 | 6 | 7 | 8 | Load Voltage | DC Load Connector | ||
|
IEEE 802.3af using data pairs |
48 V DC, protected | RX, DC+ | RX, DC+ | TX, DC- | spare | spare | TX, DC- | spare | spare | (embedded) | Industry Standard for active PoE | |
|
IEEE 802.3af using spare pairs |
48 V DC, protected | RX | RX | TX | DC+ | DC+ | TX | DC- | DC- | (embedded) | Industry Standard for passive PoE | |
| Intel, Symbol, Orinoco |
Usually 12 or 24 V DC |
RX | RX | TX | DC+ | DC+ | TX | DC- | DC- | (embedded) | Most Brands of PoE | |
|
Cisco (OLD old standard) |
48 V DC | RX | RX | TX | DC- | DC- | TX | DC+ | DC+ | (embedded) |
Older Cisco polarity is REVERSED |
|
|
Cisco (NEW old standard) |
48 V DC | RX | RX | TX | DC+ | DC+ | TX | DC- | DC- | (embedded) | New Cisco is IEEE compliant | |
|
Cisco (very unusual) |
28 V DC | DC+ | DC- | TX | n.c. | n.c. | TX | RX | RX | (embedded) | Seen on Cisco 7936 conference station | |
| D-Link (Adapter) | 48 V DC | RX | RX | TX | DC+ | DC+ | TX | DC- | DC- |
5VDC@2.5A |
DC coaxial 5.5/2.5mm |
D-Link PoE Adapter for non-PoE products. |
| Apple MacIntosh AirPort PoE, Extreme | 48 V DC | RX | RX | TX | DC?? | DC?? | TX | DC?? | DC?? | Converted to ??? |
DC coaxial (???) |
Mac Polarity Unknown |
| HyperLink | Many DC Voltages Available | RX | RX | TX | DC+ | DC+ | TX | DC- | DC- | same as input | DC coaxial and others available | Variety of Options Available to Fit Most Brands of PoE |
|
NYC Wireless Roll Your Own |
12 or 24 or 48 V DC | RX | RX | TX | DC+ | DC+ | TX | DC- | DC- | same as input |
DC coaxial or as reqd |
New York City Wireless PoE |
| 3Com AirConnect | 24 V DC | RX | RX | TX | spare | spare | TX | DC+ | DC- | 3Com AirConnect wireless access points | ||
| Alvarion VL | 55 Vdc | RX | RX | TX | DC+ | DC- | TX | DC+ | DC- | |||
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 |
правильный
с ошибками