What is wifi: WiFi is a brand and also the acronym used by the company that created it to refer to a wireless network technology (the term has been used as Wireless Fidelity (Wi-Fi) by the same company, which literally means Wireless Fidelity, although strictly speaking does not mean anything special, but the brand is a play on words suggesting that high-fidelity, conceived as a good name for the technology). It consists of standards for networks that do not require cables, which work according to certain pre-established protocols. Although it was created to access any wireless local network engine, it is very common today is used to establish Internet connections and in fact has become synonymous with that.The company behind the technology standard or WiFi is Wi-Fi Alliance, which is responsible for certifying that the equipment meets the applicable standards or regulations, if the device in question meets the certification requirements, may carry the distinctive logo with which we associate with such networks. (The family of IEEE 802.11 standards is technically where the letters refer to "Institute of Electrical and Electronics Engineers," which in Spanish translates as "Institute of Electrical and Electronics Engineers," a global partnership dedicated to just standardization in terms of new technologies).This new technology arose from the need to establish a wireless connection mechanism that is compatible between different devices (although technically not difficult to transmit information wirelessly, you must agree among manufacturers for the communication protocol is universal, so you can interpret this information in a manner consistent on different computers). In pursuit of that support was that in 1999, companies 3Com, Aironet, Intersil, Lucent Technologies, Nokia and Symbol Technologies met to create the Wireless Ethernet Compability Alliance (WECA), now called Wi-Fi Alliance.The year after its creation, the WECA certified that all devices would have the WiFi compatible, then ensuring that it complies with the criteria stipulated in the protocol of the standard IEEE 802.11. Specifically, with regard to the common user, this technology allows Internet connections without any wires and can be found anywhere that has established a "hot spot" or hotspot WiFi (called in this way to places with wireless access to the network is not the case, but to satisfy the curiosity of the reader, this term arose from the idea that someday the WiFi would be what is today the prepaid phone, where people pay to connect to network in these "hot spots." Actually this was not entirely so, but the name remains in force).The family of 802.11 standards has naturally been evolving since its creation, improving the range and speed of information transfer, among other things. The original version of course standard is outdated, but from the 802.11a, the original with some modifications are in use different versions:
IEEE 802.11b operates in the 2.4 GHz band at speeds up to 11 Mbps
The IEEE 802.11g also operates in the 2.4 GHz, but at a faster rate, reaching up to 54 Mbps
THE IEEE 802.11a above is known as WiFi 5, since it operates in the 5 GHz band at speeds of 54 Mbps One of the main advantages of this connection is that it has less interference than those operating in 2.4 GHz bands because the band does not share transactions with other technologies such as Bluetooth.
In March 2007 approved the 802.11-2007 standard, which includes a number of amendments to previous versions.
The IEEE 802.11n standard operates in the 2.4 GHz at a speed of 108 Mbps, and also adds the possibility of multiple antennas at the receiver and transmitter of the signal (MIMO) to improve performance. This standard was published in October 2009.
This is mentioned only by way of information, since small improvements and changes are made constantly.To have this kind of technology is required for a portion of an access point, as the case of routers, and a compatible device with WiFi technology, like a computer that is capable of that, or an external modem that allows access to these networks (as in the case of some companies offering pendrives, embodying an antenna and the said access capability). It is noteworthy that this technology have a limited range of range, depending on the devices involved (you can even deploy an antenna system "repeaters" that increase the scope, but the important thing is to plot that is intended for short-range or range) . Although the connection system is quite simple, they often bring difficulties configuration (not the computer that will use the signal, as the computer, but by this we mean the router or router, which for the average user could be something complicated). The system also brings risks as it is not difficult to intercept the information flowing as waves through the air. To avoid this problem we recommend encrypting the information (when visiting a secure page, such as the bank, assumes the encryption, but still some experts recommend not to use such networks for operations involving personal information security-sensitive) ..Currently, many cities have installed WiFi nodes that allow users to connect. It is increasingly common to see people connect to the Internet from cafes, subway stations and libraries, among many other places.
Copy Right 2012 - What is wifi
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