Chapter 1 Getting to Know Your Switch
GS2220 Series User’s Guide
28
1.1.6 Po E
The Switch is a Power Sourcing Equipment (PSE) because it provides a source of power through its
Ethernet ports. Each device that receives power through an Ethernet port is a Powered Device (PD).
The Switch can adjust the power supplied to each PD according to the PoE standard the PD supports.
PoE standards are:
• IEEE 802.3af Power over Ethernet (PoE)
• IEEE 802.3at Power over Ethernet (PoE) Plus
The following table describes the PoE features of the Switch by model.
For example, if an IP camera requires 25 watts power on average, then the Switch can supply PoE to up
to 15 IP cameras on the GS2220-28HP and GS2220-50HP. See
Section 8.8 on page 114 for more details on
the total PoE budget.
1.2 Exa mple Applic a tio ns
This section shows a few examples of using the Switch in various network environments. Note that the
Switch in the figure is just an example Switch and not your actual Switch.
1.2.1 Po E Exa m ple Applic a tion
The following example figure shows a Switch supplying PoE (Power over Ethernet) to Powered Devices
(PDs) such as an IP camera, a wireless router, an IP telephone and a general outdoor router that are not
within reach of a power outlet.
Table 2 GS2220 Series Models and PoE Features
PO E FEATURES G S2220- 10HP G S2220- 28HP G S2220- 50HP
IEEE 802.3af PoE Yes Yes Yes
IEEE 802.3at PoE Plus Yes Yes Yes
Power Management Mode Consumption
Classification (default)
Consumption
Classification (default)
Consumption
Classification (default)
PoE Power Budget 180 W 375 W 375 W
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