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PoE

What is PoE +

The original IEEE 802.3af-2003 PoE standard provides up to

15.4 W of DC power (minimum 44 V DC and 350 mA to each

device. Only 12.95 W is assured to be available at the powered

device as some power is dissipated in the cable. The updated

IEEE 802.3at PoE standard also known as PoE+ or PoE plus,

provides up to 25.5 W of power.

PoE+ is benecial for devices that require more power such as

Pan-Tilt-Zoom cameras, thin clients and video phones. It also

expands PoE functionality to a wider range, making it possible

to power a larger number of edge devices from a single PoE port.

How can PoE be Green?

Using D-Link’s integrated time-based PoE functionality, it is

possible to automatically shut down ports which also shut

down the devices on a predened schedule, saving power,

money and increasing security.

Benets of PoE

•

Reduced Costs – With PoE, only one cable - a simple

CAT-5 Ethernet is required to be routed to each device

instead of two and fewer power adapters are needed.

In large organisations this brings a major cost reduction.

•

Flexibility – A PoE enabled appliance can be installed

virtually anywhere; without the need for AC outlets.

This provides exibility and scalability in placing this

network equipment – Switches, Wireless Access Points,

and IP Cameras – at the most optimal locations instead of

locations where power is available. This also enables

better network designs.

•

Reliability - PoE infrastructure enables centralised power

management that provides back up with an Uninterrupted

Power Supply (UPS) to the devices and all the distributed

PD networking devices; even during power failures this

ensures the reliability and availability of powered devices.

•

Network Control – Network administrators can control

and monitor devices using SNMP. Devices can be powered

down when not in use or if there is unauthorised access,

which allows for increased security.

• Simplicitytoadd,moveandchangethenetwork-

PoE-enabled switches help network additions, moves and

changes to be accomplished faster. It allows the network

to be more exible and accommodating to changing

business and network requirements.

• CentralisedPowerManagement- Centrally managed

power enables remote shutdown or remote reset

capabilities. Through managing a PoE-enabled LAN switch

via a web browser or by SNMP, remote networking devices

can be easily reset or shut down saving the time and

expense of dispatching a technician.

• Security- Shutting down unnecessary PoE network

devices when no one is at the oce ensures better

business security.

• Eco-friendly- As with security, shutting down unnecessary

PoE network devices can also save power and money for a

business.

PoE (Power Over Ethernet)

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