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1 PoE Configuration
When configuring PoE, go to these sections for information you are interested in:
z PoE Overview
z PoE Configuration
z PoE Configuration Example
PoE Overview
Introduction to PoE
Power over Ethernet (PoE)-enabled devices use twisted pairs through electrical ports to supply power
to the remote powered devices (PD) in the network and implement power supply and data transmission
simultaneously.
Advantages of PoE
z Reliability: The centralized power supply provides backup convenience, unified management, and
safety.
z Easy connection: Network terminals only require an Ethernet cable, but no external power supply.
z Standard: PoE conforms to the 802.3af standard and uses a globally uniform power interfaces;
z Bright application prospect: PoE can be applied to IP phones, wireless access points (APs),
chargers for portable devices, card readers, network cameras, and data collection system.
PoE components
PoE consists of three components: power sourcing equipment (PSE), PD, and power interface (PI).
z PSE: PSE is comprised of the power and the PSE functional module. It can implement PD
detection, PD power information collection, PoE, power supply monitoring, and power-off for
devices.
z PD: PDs receive power from the PSE. PDs include standard PDs and nonstandard PDs. Standard
PDs conform to the 802.3af standard, including IP phones, Wireless APs, network cameras and so
on.
z PI: PIs are RJ45 interfaces which connect PSE/PDs to network cables.
PoE Features Supported by Switch 4500
PoE-capable 4500 switches include:
z Switch 4500 PWR 26-Port
z Switch 4500 PWR 50-Port
A PoE-capable Switch 4500 has the following features:
z As the PSE, it supports the IEEE802.3af standard. It can also supply power to the PDs that do not
support the 802.3af standard.
z It can deliver data and current simultaneously through data wires (1,2,3,and 6) of category-3/5
twisted pairs.