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TRENDnet User's Guide
PoE Configuration
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.
Maximum Power
Class
Output
from a Switch Port
0
15.4W
1
4.0W
2
7.0W
3
15.4W
4
34.2W
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Power Ranges of the PDs
0.44W to 12.95W
0.44W to 3.84W
3.84W to 6.49W
6.49W to 12.95W
25.5W to 38.9W
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.
However, when the PD power requirements exceed the total available power, the
switch denies power to some ports based on a process called port prioritization.
The ports on the PoE switch are assigned to one of three priority levels. These levels and
descriptions are listed in Table 3. Without enough power to support all the ports set to
the same priority level at one time, the switch provides power to the ports based on the
port number, in ascending order. For example, when all of the ports in the switch are set
to the low priority level and the power requirements are exceeded on the switch, port 1
has the highest priority level, port 2 has the next highest priority level and so forth.
Priority Level
This is the highest priority level. Ports set to
the Critical level are guaranteed to receive
Critical
power before any of the ports assigned to
the other priority levels.
Ports set to the High level receive power
High
only when all the ports assigned to the
Critical level are already receiving power.
This is the lowest priority level. Ports set to
the Low level receive power only when all
Low
the ports assigned to the Critical and High
levels are already receiving power. This
level is the default setting.
TPE-TG50ES
Description
35
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