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8 pin RJ45 (8P8C) female connector layout
8 pin RJ45 (8P8C) female connector
at the hub
8 pin RJ45 (8P8C) male connector layout
8 pin RJ45 (8P8C) male connector
at the cable
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.

 

IEEE 802.3af standard POE pinout:
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
or 12VDC@1A

 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

Maximum length of the cable PoE UTP 5cat.
Input Voltage 9 V: < 30 m
Input Voltage 12 V: < 60 m
Input Voltage 24 V and more answers the quality IEEE 802.3af standard.
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