CAT5 PoE using only 4 Wires Diagram & Pinouts

Modified on Fri, Feb 19, 2016 at 10:55 AM

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

Here is a picture of ICC Jack Module with Wires Connected

The industry standard color codes for pins etc is pictured below just as a reference for the chart below

So as you can see, we are actually using pins 1,2,3,6 since we are using color wht-org, org-wht, wht-grn, grn-wht

===============================================================================================================

The original IEEE 802.3af-2003 PoE standard devices provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA) to each device.

The newer PoE+ IEEE 802.3at-2009 PoE standard provides up to 25.5 W of power. Some vendors have announced products that offer up to 51 W of power over a single cable by utilizing all four pairs in the Category 5 cable.

POE devices pinouts of various 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-
TP-link TL-SF1008P		DC-	DC-	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

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CAT5 PoE using only 4 Wires Diagram & Pinouts

IEEE 802.3af standard POE pinout:

Here is a picture of ICC Jack Module with Wires Connected

So as you can see, we are actually using pins 1,2,3,6 since we are using color wht-org, org-wht, wht-grn, grn-wht

POE devices pinouts of various manufacturers

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CAT5 PoE using only 4 Wires Diagram & Pinouts

IEEE 802.3af standard POE pinout:

Here is a picture of ICC Jack Module with Wires Connected

So as you can see, we are actually using pins 1,2,3,6 since we are using color wht-org, org-wht, wht-grn, grn-wht

POE devices pinouts of various manufacturers

Was this article helpful?