Power over Ethernet Benefits
network designers and administrators, PoE simplifies the task of
powering devices in remote locations. In one key example, PoE
changes the entire cost structure for deployment of VOIP phones
in an enterprise, where phones need to be placed in locations
without dependency on AC outlets.
primary benefits include:
savings - PoE
significantly reduces the need for electricians to install
conduit, electrical wiring, and outlets throughout the
enterprise. With PoE only one cable – a simple CAT-5 Ethernet
– is required. Estimates of cost savings using PoE range from
$500 to $1,000 per port. In larger settings, this represents
a major cost reduction.
Flexibility - A PoE
appliance or device can be located anywhere without the need for
AC outlets. For example, wireless LAN access points can be
located – and relocated – on or near ceilings, to fine tune
optimum RF reception. For example, customers often find that
access points are more effective on the ceiling, out of reach
from an AC outlet.
Because PoE networks have fewer wires, there is less likelihood
of an inadvertent power disruption (accidental shut off, etc).
With an Uninterrupted Power Supply (UPS) power to the devices is
assured during a power failure.
Network Control -
Using SNMP, network administrators can monitor and control
powered devices, including resetting or shut-off. This allows
increased security, as devices can be powered down when not in
use, or if there is unauthorized access.
Safety - Power mains are
eliminated. Since only 48v DC is used, PoE conforms to
Underwriter's Laboratories (UL) Safety Extra Low Voltage (SELV)
These benefits provide significant bottom
line business impact. As a result, a Gartner Group
study credited PoE with driving growth in the Ethernet
switch business, justifying its $40- $65 (U.S.) per port