Allied Telesis AT-x230-10GP Installation Guide download pdf (Page 26)

Chapter 1: Overview

Power over Ethernet (PoE)

The AT-x230-10GP and AT-x230-18GP 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

cables that carry the network traffic.

The main advantage of PoE is that it can make it easier to install a

network. 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 PoE to other network devices is referred to as

power sourcing equipment (PSE). Both the AT-x230-10GP and AT-x230-

18GP switches act as PSE units by adding DC power to the network

cable, thus functioning as a central power source for other network

devices.

Devices that receive their 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.

PoE standards The AT-x230-10GP and AT-x230-18GP 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 device

classes

Powered devices are grouped into the five classes listed in Table 1 on

page 17. The classes are based on the amount of power the devices

require. Both the AT-x230-10GP and AT-x230-18GP switches support all

five classes.

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Allied Telesis AT-x230-10GP Installation Guide Page 26