Power over Ethernet (PoE)

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Image:connector_rj45f.png 8 pin RJ45 (8P8C) female connector at the hub.

Image:connector_rj45m.png 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

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
(OLD old standard) 48 V DC RX RX
(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


Category: Networking Connectors


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