Power over Ethernet (PoE) is the term for a system that allows both data and DC electrical power to transmit over an Ethernet line. This technology has amazing capabilities, particularly for VoIP phones. PoE is also commonly referred to as Power over LAN (PoL) and Inline Power.

PoE eliminates the need to run two separate lines for both electrical power and digital data. This not only cuts down on unnecessary lines, it offers a solution for situations where two lines can’t be run side-by-side. Also, PoE can be installed anywhere, regardless of whether it’s near an AC power outlet. This offers greater flexibility for the location of the PoE system.

Not only is PoE convenient, it saves money because there is less electrical usage. Also, using a PoE system that is Simple Network Management Protocol (SNMP) manageable will protect your system from power surges and outages. This is because your power will be remotely controlled and monitored. Data will be preserved with such a guarantee and it only adds to the convenience of the device.

How it Works

A typical PoE system has two main components. One is the power sourcing equipment (PSE), which carries the electrical power. The other component is the powered device (PD), which receives the power and uses it properly.

The PSE will not send a large amount of power to a non-PD device, as that would cause problems and possibly damage the system. Instead, the PSE and PD work together to make sure that electrical charges are going to the proper place. Simultaneously, while electrical power is supplied through a PoE system, digital data is transferred over the Ethernet.

What to Look For

While there are currently several different ways to configure a PoE system. However, the Institute of Electrical and Electronics Engineers, Inc. has agreed to a standard, known as IEEE 802.3af. This standard dictates how much voltage is to be used and how it is to be administered.

When using a PoE to power your VoIP phone, look for hardware that is IEEE 802.3af compliant. Technical support should be available through the manufacturer, should you have trouble installing the equipment.

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