Power over Ethernet (PoE)
Power over Ethernet (PoE) is technology that allows Ethernet cables to transmit power and data simultaneously using a single network cable. It enables one RJ45 cable to provide both electric power and data connection to powered devices (PDs), instead of having a separate cable for each. This enables network installers to deploy PDs in locations that lack electrical circuitry. PoE eliminates the cost of installing additional electrical wiring, requiring professional electrical installers to ensure that strict conduit regulations are followed. Common types of PoE applications include: IP cameras, VOIP phones, wireless access points, ATMs, IP intercoms, IP clocks, security card readers and PoE lighting.
PoE switches are network switches that can provide PoE from each interface while still being able to forward frames. Both managed and unmanaged PoE switches are available. A PoE switch requires one uplink to an existing network to expand and increase ports.
PoE injectors are devices commonly used between a non-PoE-capable switch and a PoE-capable PD (such as an IP camera). They add power to a network cable to ensure that a connected PD can receive power and operate without a connected DC power supply. When the cost of a switch is not practical, PoE injectors provide a solution when fewer PoE ports are required. Injectors allow administrators to populate and properly support LANs with both compliant and non-compliant devices.
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