Power Over Ethernet - Comparison With Other Integrated Data and Power Standards

Comparison With Other Integrated Data and Power Standards

PoE provides both data and power connections in one cable, so equipment doesn't require a separate cable for each need. For equipment that does not already have a power or data connection, PoE can be attractive when the power demand is modest. For example, PoE is useful for IP telephones, wireless LAN access points, cameras with pan tilt and zoom (PTZ), and remote Ethernet switches. PoE can provide long cable runs e.g., 100 m (330 ft) and deliver 12 W of galvanically isolated power. PoE-plus provides even more power.

There are competing technologies. The Universal Serial Bus (USB) provides both data and power, but it is designed for short cables with a maximum length of 5 m (16 ft) and provides less than 2.5 W of non-isolated power. It is less expensive than PoE, and works well for low power peripherals such as a computer mouse, a headset/microphone, or a serial port. Some peripherals, such as speakers, scanners, and printers, need more power than USB can provide. Firewire (IEEE 1394) is similar to USB, but can provide substantially more power (45 W) but has an even shorter limit on cables at 4.5 m. On the other hand, USB peripherals can operate using very little power; while maintaining an Ethernet connection uses a significant amount of power.

If a device already has power available but no data link, then PoE may not be attractive. A wireless data connection such as IEEE 802.11 may be more economical than running a data cable for the device. Alternatively, there are power line communication technologies that can use power cables for transmitting data. Using some power line modems may be more economical than running a cable.

When data rate and power requirements are both low, other approaches may be viable. Mobile phones, for example, use batteries for power and microwave antennas for communication. Remote weather sensors use very low data rates, so batteries (sometimes supplemented with solar power) and custom wireless data links are used.

Depending on the application, some of the advantages with PoE over other technologies may be:

  • Inexpensive cabling
  • Fast data rate
  • No batteries required
  • Peer-to-peer network access. Once a device is connected to the network, it is accessible to many users.

Read more about this topic:  Power Over Ethernet

Other articles related to "data, power":

Power Sourcing Equipment - Comparison With Other Integrated Data and Power Standards
... PoE provides both data and power connections in one cable, so equipment doesn't require a separate cable for each need ... For equipment that does not already have a power or data connection, PoE can be attractive when the power demand is modest. 100 m (330 ft) and deliver 12 W of galvanically isolated power ...

Famous quotes containing the words comparison with, standards, power, comparison, integrated and/or data:

    Clay answered the petition by declaring that while he looked on the institution of slavery as an evil, it was ‘nothing in comparison with the far greater evil which would inevitably flow from a sudden and indiscriminate emancipation.’
    State of Indiana, U.S. public relief program (1935-1943)

    A generation which has passed through the shop has absorbed standards and ambitions which are not of those of spaciousness, and cannot get away from them. Everything with them is done as though for sale, and they naturally have in view the greatest possible benefit, profit and that end of the stuff that will make the best show.
    Alexander Herzen (1812–1870)

    High treason, when it is resistance to tyranny here below, has its origin in, and is first committed by, the power that makes and forever re-creates man.
    Henry David Thoreau (1817–1862)

    Intolerance respecting other people’s religion is toleration itself in comparison with intolerance respecting other people’s art.
    Wallace Stevens (1879–1955)

    Science is intimately integrated with the whole social structure and cultural tradition. They mutually support one other—only in certain types of society can science flourish, and conversely without a continuous and healthy development and application of science such a society cannot function properly.
    Talcott Parsons (1902–1979)

    This city is neither a jungle nor the moon.... In long shot: a cosmic smudge, a conglomerate of bleeding energies. Close up, it is a fairly legible printed circuit, a transistorized labyrinth of beastly tracks, a data bank for asthmatic voice-prints.
    Susan Sontag (b. 1933)