Power over Ethernet (POE) Pinout for Cisco IP Phones and Switches

[Marcos Hernandez]

STANDARD	SOURCE								COMMENTS
	Ethernet RJ-45 connector pin number
	1	2	3	4	5	6	7	8
IEEE 802.3af using data pairs	RX DC+	RX DC+	TX DC-	spare	spare	TX DC-	spare	spare	Industry Standard for Embedded POE (used by Cisco Catalyst Switches)
IEEE 802.3af using spare pairs	RX	RX	TX	DC+	DC+	TX	DC-	DC-	Industry Standard for Embedded POE
Cisco (old standard)	RX	RX	TX	DC-	DC-	TX	DC+	DC+	Older Cisco Products (polarity is reversed)
Cisco (new standard)	RX	RX	TX	DC+	DC+	TX	DC-	DC-	IEEE Compliant

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