Poe Overview; Principles - Huawei AR150 Series Configuration Manual

Huawei AR150&200&1200&2200&3200 Series Enterprise
Routers
Configuration Guide - Device Management

6.1 PoE Overview

This section describes the definition, purpose, and benefits of PoE.
Definition
Power over Ethernet (PoE) provides power through the Ethernet. It is also called Power over
LAN (PoL) or active Ethernet.
Purpose
As IP phones, network video monitoring, and wireless Ethernet networks are widely applied,
the power supply requirements on the Ethernet become urgent. In most situations, access point
devices need DC power supply, but access point devices are often installed outdoors or on the
ceiling that has a long distance from the ground. The nearby proper power socket is difficult to
find. Even if the proper power socket is available, the network administrator finds it hard to
install the AC/DC converter required by access point devices. On many large-scale LANs,
administrators need to manage multiple access point devices that require uniform power supply
and management. In this case, power supply management is difficult. The PoE function
addresses this problem.
The PoE technology is used on the wired Ethernet and is most widely used on local LANs. The
PoE function transmits power together with data to terminals over cables or transmits power
without data over idle lines. This technology provides power on the 10Base-T, 100Base-TX, or
1000Base-T Ethernet at a distance of up to 100 m. PoE can be used to effectively provide
centralized power for terminals such as IP phones, Access Points (APs), chargers of portable
devices, POS machines, cameras, and data collection devices. Terminals are provided with
power when they access the network. Therefore, indoor cabling of power supply is not required.
The PoE has the following advantages:
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Benefits
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6.2 Principles

Introduction to PoE
PoE involves the following devices:
Issue 05 (2014-01-16)
Reliable: Multiple PDs are powered by one device, facilitating power backup.
Easy to deploy: Network terminals can be powered over network cables, without a need
for external power sources.
Standard: The PoE function complies with IEEE 802.3af and 802.3at, and all PoE devices
use uniform power sources.
Saves the costs on the cabling of power supply and facilitates power module installation.
Works with the Uninterruptible Power Supply (UPS) to provide backup power supply for
IP cameras, video servers, and IP phones, and prevents power-off.
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