TRENDnet TPE-P521ES, User Manual, Page: 48 / 68

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TRENDnet User’s Guide
TPE-P521ES
45
PoE
Power over Ethernet
The main advantage of PoE is that it can make installing a network easier. The selection
of a location for a network device is often limited by whether there is a power source
nearby. This constraint limits equipment placement or requires the added time and cost
of having additional electrical sources installed. However, with PoE, you can install PoE
compatible devices wherever they are needed without having to worry about whether
there is power source nearby.
Power Sourcing Equipment (PSE)
A device that provides PoE to other network devices is referred to as power sourcing
equipment (PSE). The Gigabit Web Smart PoE+ Switch is a PSE device which provides DC
power to the network cable and functions as a central power source for other network
devices.
Powered Device (PD)
A device that receives power from a PSE device is called a powered device (PD).
Examples include wireless access points, IP phones, webcams, and even other Ethernet
switches.
PD Classes PDs are grouped into five classes. The classes are based on the amount of
power that PDs require. The Gigabit Web Smart PoE+ Switch supports all five classes.
Class
Maximum Power
Output
from a Switch Port
Power Ranges of the PDs
0 15.4W 0.44W to 12.95W
1 4.0W 0.44W to 3.84W
2 7.0W 3.84W to 6.49W
3 15.4W 6.49W to 12.95W
4 25.5W 12.95W to 25.5W
Power Budget
Power budget is the maximum amount of power that the PoE switch can provide at one
time to the connected PDs. Port Prioritization As long as the total power requirements
of the PDs is less than the total available power of the switch, it can supply power to all
of the PDs.
View PoE status
PoE > Power over Ethernet
1. Log into your switch management page (see “ Access your switch management page ”
on page 7).
2. Click on PoE and click on Power over Ethernet.
3. The table on this page displays the switch’s overall PoE statistics and status.

Power Budget – Total amount of power that the switch can provide to all PD’s
simultaneously.

Power Used – Amount of power currently being supplied to PD’s.

Power Left – Amount of power currently available for new PD’s.

Percentage of system power supplied – Percentage out of total amount of
power currently being used by PD’s.