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Power over Ethernet (PoE) is the ability for the LAN switching infrastructure to provide power over a copper Ethernet cable to an endpoint or powered device.

This capability was developed and first delivered by Cisco in 2000 in order to support the emerging IP Telephony deployments. IP telephones, such as desktop PBX phones, need power for their operation, and PoE enables scalable and manageable power delivery and simplifies deployments of IP Telephony.

While IP telephones and wireless access points (APs) are the most intuitive uses for PoE, the advent of the 802.3af standardization of PoE opens the door to a new generation of network-attached devices, such as video cameras, point-of-sale devices, security access control devices (card scanners), building automation and industrial automation.

PoE promises to create a new world of networked appliances as it provides power and data connectivity over existing Ethernet cables.

• 7945G
• 7975G

Note: These Cisco IP phones support both the Cisco pre-standard PoE and IEEE 802.3af PoE:

• 7970G
• 7961G
• 7906G
• 7941G
• 7962G

Q. Can a Cisco switch be forced to provide pre-standard PoE to an 802.3af-compliant IP phone?

A. There is no way to force the switch to provide pre-standard PoE, because the power allocation is done automatically through negotiation.

• CP-7960G (6.3W)
• CP-7906G (5W) (Class 2)
• CP-7911G (5W) (Class 2)
• CP-7941G (6.3W) (Class 2)
• CP-7941G-GE (12.9W) (Class 3)
• CP-7961G (6.3W) (Class 2)
• CP-7961G-GE (12.9W) (Class 3)
• CP-7970G (10.25W) (Class 3)
• CP-7971-G-GE (15.4W) (Class 3)
• (12.55W) (Class 0, Not full brightness)
• IEEE 802.3af Device – Class 0 (15.4W)
• IEEE 802.3af Device – Class 1 (4W)
• IEEE 802.3af Device – Class 2 (7W)
• IEEE 802.3af Device – Class 3 (15.4W)

Note: PDF file of

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