3com S7906E 설치 설명서
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PoE Configuration
The S7900E Series Ethernet Switches are distributed devices supporting Intelligent Resilient
Framework (IRF). Two S7900E series can be connected together to form a distributed IRF device. If
an S7900E series is not in any IRF, it operates as a distributed device; if the S7900E series is in an
IRF, it operates as a distributed IRF device. For introduction of IRF, refer to IRF Configuration in the
System Volume.
When configuring PoE, go to these sections for information you are interested in:
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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.