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Power over Ethernet (PoE) technology describes any system that transmits electrical power, in addition to data, to remote devices over standard twisted-pair wire in an Ethernet network. This technology is useful for powering IP telephones, wireless LAN access points, webcams, hubs, and other appliances where it would be inconvenient or infeasible to supply power separately. The technology is comparable to POTS telephones, which also receive power and data (although analog) through the same cable. It works without requiring modification to the existing Ethernet cabling infrastructure. Power over Ethernet is standardized in IEEE 802.3af.
IEEE 802.3af compliant power sources supply 48 volts DC to devices at a maximum current of 350 mA. This allows devices to draw about 15.4 watts. A twisted-pair Ethernet wire contains four pairs. The Ethernet protocol only uses two of these pairs for data. The 802.3af standard allows power transmission over the two unused pairs, or the two data pairs. To prevent damage to devices that don't accept power over Ethernet, an 802.3af power source won't begin sending power until a remote device acknowledges that it can accept power.
(Ref. Wikipedia)
More information on Power Over Ethernet at www.PowerOverEthernet.com
Power
over Ethernet White Paper
The
Magnum PS14P
Power Source Switch is
a 4-port PoE heavy duty Ethernet Switch with a temperature
rating of -40șC to 75șC.
 Datasheet
Pictorial
Common Applications:
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Connect a V0IP
phone, a PoE powered digital
clock, and an IP badge reader in an outdoor guard station into
an indoors LAN using standard Ethernet twisted-pair copper cable
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Connect an
IP wireless access point in a warehouse into the factory LAN
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For
surveillance, connect a couple of outdoor PoE video cameras into a secure LAN
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