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TRENDnet User's Guide
Power over Ethernet 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 additional time and cost to have extra electrical
sources installed. However, with PoE, you can install PoE 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 TPE-4840WS is a PSE device which
provides DC power through 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 TPE-4840WS supports all five
classes.
Class
Maximum Power
Output
0
15.4 W
1
4.0 W
2
7.0 W
3
15.4 W
4
34.2 W
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Power Range of PDs
0.44 W to 12.95 W
0.44 W to 3.84 W
3.84 W to 6.49 W
6.49 W to 12.95 W
25.5 W to 38.9 W
Power Budget
Power budget is the maximum amount of power that the PoE switch can
provide to all the connected PDs at the same time. 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.
When the PD power requirements exceed the total available power
budget, the switch denies to supply 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:
Critical, High and Low. If all PoE ports are set to the same PoE port priority
and the PoE power supply is over the budget, the switch provides power
to the ports based on the port number, in ascending order. For example,
when all of the ports on the switch are set to the PoE low priority and the
power requirements are over budget, the port 1 has the highest priority
to get the power supply, port 2 has the next highest priority and so on and
so forth.
PoE
Priority
Critical
This is the highest PoE priority. Ports set to the
Critical level are guaranteed to receive power before
any of the ports assigned to the other priority levels.
High
Ports set to the High level receive power only when all
the ports assigned to the Critical level are already
receiving power.
Low
This is the lowest priority level. Ports set to the Low
level receive power only when all the ports assigned
to the Critical and High levels are already receiving
power. This level is the default setting.
TPE-4840WS
Description
94
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