Power over Ethernet (PoE) transmits power over Ethernet cables, with IEEE 802.3af protocol as the standard. It is useful where plugging into a wall outlet is inconvenient, and is ideal for older buildings and VOIP telephones. The technology is threatened by wireless networks, but could replace traditional power supplies worldwide.
Power over Ethernet (PoE) is any technology that transmits power over an Ethernet cable. The guidelines for standardization are established as IEEE 802.3af protocol. This protocol and PoE are not necessarily the same thing, but in practice, devices that conform to the standard will likely eventually dominate the market.
Whenever an Ethernet cable is available but plugging into a wall outlet is a hassle, Power over Ethernet can come in handy. The technology is under threat as Ethernet cables are almost universally being phased out in favor of wireless networks. In the 802.3af standard, 48 volts of DC power is sent through the cable at a current of 350mA to provide approximately 13 watts of power. Discussions in 2005 led to a new standard, 802.3at, which doubles the available power.
Desktop computers in offices of the future could be powered by just an Internet cable, eliminating the need for additional electrical cables. Power over Ethernet is also ideal for older buildings with limitations on existing electrical wiring. The technology is facilitated by a simple adapter, which first “probes” a target to see if it can accept electrical power. After this is verified, power is sent through the cable in conjunction with data.
Power over Ethernet technology is popular for use with Voice over IP (VOIP) telephones, which could eventually replace conventional telephones. Dedicated minicomputers have been built that draw only 13 watts, making them highly compatible with this form of power distribution. Since the technology only provides 13 or 26 watts, use with power-hungry mainstream PCs in the foreseeable future isn’t likely.
The goal of Power over Ethernet is to replace traditional power supplies for computing worldwide. Plugs and sockets vary by country, but Ethernet technology and cables are universal. For this reason, the technology is especially popular in countries where computing is still being implemented. There are hundreds of companies pioneering the technology and trying to push it into the mainstream.
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