1 poe configuration, Poe overview, Introduction to poe – H3C Technologies H3C S5120 Series Switches User Manual
Page 714: Advantages, Composition, Poe configuration
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PoE Configuration
When configuring PoE, go to these sections for information you are interested in:
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Configuring PoE Power Management
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Configuring the PoE Monitoring Function
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Configuring PoE Interface through PoE Profile
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Upgrading PSE Processing Software in Service
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Displaying and Maintaining PoE
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PoE Overview
Introduction to PoE
Power over Ethernet (PoE) means that power sourcing equipment (PSE) supplies power to powered
devices (PDs) from Ethernet interfaces through twisted pair cables.
Advantages
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Reliable: Power is supplied in a centralized way so that it is very convenient to provide a backup
power supply.
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Easy to connect: A network terminal requires no external power supply but only an Ethernet cable.
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Standard: In compliance with IEEE 802.3af, and a globally uniform power interface is adopted.
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Promising: It can be applied to IP telephones, wireless LAN access points (APs), portable
chargers, card readers, web cameras, and data collectors.
Composition
As shown in
, a PoE system consists of PoE power, PSE, power interface (PI), and PD.
1) PoE power: The whole PoE system is powered by the PoE power.
2) PSE: A PSE is a device supplying power for PDs. A PSE can be built-in (Endpoint) or external
(Midspan). A built-in PSE is integrated in a switch or router, and an external PSE is independent
from a switch or router. The PSEs of H3C are built in, and can be classified into two types:
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Device with a single PSE: Only one PSE is available on the device; so the whole device is
considered as a PSE.
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Device with multiple PSEs: For a device with multiple PSEs, an interface board with the PoE
power supply capability is a PSE. The system uses PSE IDs to identify different PSEs. You can
use the display poe device command to display the mapping between a PSE ID and the slot
number of an interface board.