|
Power over Ethernet (PoE):
Technology Primer and Deployment Considerations
What is Power over Ethernet?
Power over Ethernet (PoE) is an evolving technology that
extends the already ultra-broad functionality of Ethernet by
supplying reliable DC power over the same cables that
currently carry Ethernet data. PoE, modeled after the
technology used by the telecommunications industry to supply
reliable power to telephones, enables lifeline quality power
for IP telephones (VoIP) as well as many other low power
Ethernet network devices like wireless access points (WAP)
and IP security cameras.
In 1999, the IEEE (Institute of Electrical and Electronics
Engineers) began developing the 802.3af standard, which
defined the transmission of Power over Ethernet to address
the need to ensure interoperability among a growing number
of proprietary methods of distributing DC power to network
devices.
Since acceptance of IEEE 802.3af standard in 2003, PoE
equipment vendors have been designing standards-based
products that leverage the numerous advantages offered by
PoE, such as:
• IP Telephony Sets
• Wireless Access Points (WAPs)
• IP Surveillance Cameras
•
Network Clocks
Deployment Considerations |
Midspan Advantages |
Benefits of PoE |
Diagram |
PoE Main Page |
