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Chapter 1: Overview
Power Over Ethernet
PoE Standards
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The AT-x530L-28GPX and AT-x530L-52GPX switches feature PoE on
twisted pair ports. With PoE, the switch supplies DC power to network
devices over the same twisted pair cables that carry the network traffic.
PoE can make it easier to install networks. The selection of a location for a
network device can be limited by whether there is a power source nearby.
This often limits equipment placement or requires the added time and cost
of having additional electrical sources installed. With PoE, you can install
PoE-compatible devices wherever they are needed without having to
worry about whether there are power sources nearby.
A device that provides PoE to network devices is referred to as power
sourcing equipment (PSE). It functions as a central power source for other
network devices.
Devices that receive their power from a PSE are called powered devices
(PD). Examples include wireless access points, IP telephones, webcams,
and even other Ethernet switches.
The AT-x530L-28GPX and AT-x530L-52GPX switches automatically
determine whether devices connected to their ports are powered devices.
Ports that are connected to network nodes that are not powered devices
(that is, devices that receive their power from another power source)
function as regular Ethernet ports, without PoE. The PoE feature remains
activated on the ports but no power is delivered to the devices.
The AT-x530L-28GPX and AT-x530L-52GPX switches support these PoE
standards:
PoE (IEEE 802.3af): This standard provides up to 15.4 watts at the
switch port for powered devices that require up to 13.0 watts.
PoE+ (IEEE 802.3at): This standard provides up to 30.0 watts at
the switch port for powered devices that require up to 25.5 watts.
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