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

STANDARDSOURCECOMMENTS
Ethernet RJ-45 connector pin number
12345678
IEEE 802.3af
using data pairs

RX

DC+

RX

DC+

TX

DC-

sparespare

TX

DC-

sparespare

Industry Standard for Embedded POE

(used by Cisco Catalyst Switches)

IEEE 802.3af
using spare pairs
RXRXTXDC+DC+TXDC-DC-Industry Standard for Embedded POE
Cisco
(old standard)
RXRXTXDC-DC-TXDC+DC+Older Cisco Products (polarity is reversed)
Cisco
(new standard)
RXRXTXDC+DC+TXDC-DC-IEEE Compliant

POE-Powered devices should obey following specifications:

Parameter Min Max
Signature Resistance, KOhm23.7526.25
Startup Time (till I>10mA), ms300
Power Consumption, W12.95
Operating Input Voltage Range, V3657
Must Turn on Voltage, V44
Must Turn off Voltage, V30 V
Input Current (@36Vdc), mA10350
Input Current, Peak, mA400
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