Categories

A sample text widget

Etiam pulvinar consectetur dolor sed malesuada. Ut convallis euismod dolor nec pretium. Nunc ut tristique massa.

Nam sodales mi vitae dolor ullamcorper et vulputate enim accumsan. Morbi orci magna, tincidunt vitae molestie nec, molestie at mi. Nulla nulla lorem, suscipit in posuere in, interdum non magna.

What is the need of Power over Ethernet (PoE) technology?

About Power over Ethernet

– PoE or Power over Ethernet gives a description of the standardized system developed for passing electrical power side by side with data over the Ethernet cables.
– The major advantage of this technology is that both the data and electricity can be provided to the networking devices such as closed – circuit TV cameras, network hubs or routers etc.
– This technology is not similar to the universal serial bus which powers the devices over the data cables.
– The difference is that long cable lengths are allowed in power over Ethernet technology.
– The pairs of wires that are found to be extra and ate not used in transmitting data are used the other way i.e., for supplying power.
– Maximum 25 watts are available for every device and it also depends up on which version of the standard is being used.
– There are numerous non-standard schemes that were used earlier i.e., before the standardization of the PoE technology.
– Category 5 cable is required for PoE as per the IEEE standard but it can also operate on category 3 cable when the power requirement is quite less.
– Common mode is used for supplying the power over the different parts of the wire that is used in Ethernet cables.
– A power supply unit within networking device in which PoE is enabled supplies the required power.
– This networking device might be an Ethernet switch.
– There is an alternative to this method for supplying power.
– In this method, the power is injected in to the cable run via a mid-span power supply.
– The original PoE standard of IEEE 802.3af – 2003 was capable of providing up to 15.4 w of dc power to all the devices.
– Since some power gets dissipated in the cable, therefore 12.95 w of power is only available.
– Around 25.5 W of power is provided by the updated PoE standard of IEEE 802. 3at- 2009.
– However, this standard prohibits the use of all 4 pairs by the device for power.
– The data signals of Ethernet continue to travel along the wires namely 1, 2, 3 and 6.
– Power is either routed to the leftover wires namely 4, 5, 7 and 8 or superimposed on these wires.
– The former technique is known as the mid-span technique and the latter one is called the end-span technique.
– The power is picked off by the end device at its RJ45 connector.
– It is then routed to the power circuit of the device.
– The need for powering the end device from a local 110v AC outlet is eliminated completely because of the power over Ethernet technology.
– Some other names for PoE are power over LAN and power injection.
– Using mid-span technique you can save up to 90 percent of what you would spend on traditional powering methods.

Advantages of Power of Ethernet – POE

Power of Ethernet technology is needed because of the following advantages it offers:

  • Cuts down the cost of cabling
  • Faster data rate
  • Does not requires any battery back up
  • Provides peer – to – peer network access. Once a connection is established between the device and the network, a lot many users can access it.

Uses of Power over Ethernet – PoE Technology

PoE technology has uses in number of fields such as:

  • Network routers
  • Network webcams
  • VoIP phones
  • Wireless access points
  • Industrial devices such as meters, sensors, controllers etc.
  • Access help and control points such as entry cards, keyless entry, intercoms and so on
  • Remote PoS (point of sale) kiosks
  • IP security cameras
  • Network switches for supporting a small group of ports via an up link cable
  • Network paging/ public address systems/ paging systems
  • Hallway speaker amplifiers
  • Wall clocks in which the time is set using the network time protocol
  • Outdoor mounted radios that have integrated antennas or customer premises equipment
  • Lighting controllers
  • Physical security controllers and device
  • Leave a Reply

    You can use these HTML tags

    <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>