1-1
1
PoE Configuration
PoE Overview
Power over Ethernet (PoE) means that power sourcing equipment (PSE) supplies power to powered
devices (PDs) from Ethernet interfaces through twisted pair cables.
Advantages
z
Reliable: Power is supplied in a centralized way so that it is very convenient to provide a backup
power supply.
z
Easy to connect: A network terminal requires no external power supply but only an Ethernet cable.
z
Standard: In compliance with IEEE 802.3af, and a globally uniform power interface is adopted.
z
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
Figure 1-1
, a PoE system consists of PoE power, PSE, power interface (PI), and PD.
Figure 1-1
PoE system diagram
PoE power
The whole PoE system is powered by the PoE power.
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 3Com are built in, and can be classified into two types:
z
Device with a single PSE: Only one PSE is available on the device; so the whole device is
considered as a PSE.
z
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.
Summary of Contents for 2928 - Baseline Plus Switch PWR
Page 92: ...1 9 Figure 1 7 Display the rate settings of ports ...
Page 105: ...1 4 Figure 1 3 Switch to the management level ...
Page 109: ...i Table of Contents 1 VCT 1 1 Overview 1 1 Testing Cable Status 1 1 ...
Page 114: ...1 2 Figure 1 2 Port traffic statistics ...
Page 279: ...1 28 Figure 1 26 The Port Setup tab ...
Page 331: ...i Table of Contents 1 Service Management 1 1 Overview 1 1 Configuring Service Management 1 2 ...
