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In
remote places where it is infeasible to install power
outlets, PoE technology is the best alternative. Defined
as standard IEEE 802.3af, PoE (Power over Ethernet) is a
new emerging technology that provides data and power on
a single network cable.
It
transmits power over CAT-3 or CAT-5 cables, utilizing
the spare wires within for power transmission. However,
some of the PoE setups uses “phantom feeding” which
means the same physical wire is used for both power and
data transmission.
There
are two basic components in a PoE architecture:
a.
Power Sourcing Equipment (PSE) – this might be a hub
or a switch that supplies power to PoE enabled devices.
PSE devices can be classified into two types:
(1).
Midspan – serves as intermediary between power supply
and PoE enabled devices, which is suitable for adding up
PoE functionality on an existing network.
(2).
Endspan – network switches which have built-in PoE
transmission circuitry that delivers power directly to
the PoE enabled devices.
b.
Powered Device (PD) – these are devices which are
being powered within a network.
Here
are some reasons why PoE devices are being implemented:
a.
Greater Flexibility and
Freedom – install devices anywhere you like even to
places where power supply is unavailable.
There will be no more restrictions on places
where you can install hardware.
b.
Reduced Cost and
Cabling – merge power cable and data cable into one.
PoE functionality eliminates additional UPS and
power adaptors for each device which gives you
significant cost savings.
Moreover, you don’t have to hire a certified
electrician for installation.
c.
Centrally
Monitored Power Management – you can buy one UPS
system for each of your PSE and install them in a server
room where all the necessary electrical outlets and fuse
box are located.
d.
Ease
of Management and Maintenance – power and data are
transmitted over a single cable, person in charge need
not provide separate power supply for each devices.
e.
Safety – PoE protects devices for electrical surges
and spikes. Also, it uses low power hence, lowering down
the risk of electrical injuries.
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