Power Over Ethernet (Poe); Poe Standards; Powered Device Classes - Allied Telesis AT-x230-10GP Installation Manual

Power over Ethernet (PoE)

PoE Standards

Powered Device
Classes
The x230 Series switches feature Power over Ethernet (PoE) on the 10/
1000BASE-T and 100BASE-TX ports. PoE is used to supply power to
network devices over the same twisted pair cabling that carries the
network traffic.
The main advantage of PoE is that it simplifies network installation.The
selection of a location for a network device is often 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. But 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 power to other network devices is called Power
Sourcing Equipment (PSE). The x230 Series switches act as a PSE to its
connected PDs.
A device that receives power from PSE are called powered devices (PD).
Examples of PD include wireless access points, IP telephones, webcams,
and even other Ethernet switches.
The switch automatically determines if a device connected to a port is a
powered device. 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 x230 Series switches support these PoE standards:
PoE (IEEE 802.3af): This standard provides up to 15.4 watts at the

switch port to support powered devices that require up to 12.95
watts.
PoE+ (IEEE 802.3at): This standard provides up to 30.0 watts at

the switch port to support powered devices that require up to 25.5
watts.
Powered devices are grouped into the five classes listed in Table 1 on
page 20. These classes are based on the amount of power the devices
require. The x230 Series switches support all five classes.
AT-x230-10GP, AT-x230-18GP and AT-230-28GP Switches Installation Guide
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