In the universe of the Internet, a bit player called WiFi holds all the technology of the Big Red, from the perspective of the end user.
The main protagonists are the own Internet connection or smartphone. But without WiFi, everything would collapse. How we would have evolved if the Internet was only accessible by cable or we had to always use the mobile Internet connection with their ridiculous monthly data quotas immediately exhausted, and payment bonds.
rnWifi stands for Wireless Fidelity, a set of standards for wireless networks (networks in which the communication between components is performed by electromagnetic waves); following technical specifications in compliance with IEEE 802.11 or Wi-Fi protocol; which it is a standard communications protocol Institute of Electrical and Electronics Engineers IEEE (Institute of Electrical and Electronics Engineers). The IEEE is a global professional association that, among other things, establishes protocols and standards for the operation of wireless communication systems .. Wi-Fi was created to be used in wireless local area networks LAN computers (Local Area Network), for use Internet access.
Let's discover the history of WiFi, and how it has evolved into one of the technologies without which we can not live today. Also read
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The WiFi is another system rather than transmits information via radio waves, so its origins date back to the late nineteenth and early twentieth centuries. The inventors of devices like the telephone or the radio are, in a way, inventors of the principles of WiFi.
One of the recognized precursors of WiFi was the legendary Hollywood actress Hedy Lamarr, who became world famous for her role in the movie Samson and Delilah (1949), although he participated in more than 30 films.
In his time Hedy Lamarr was christened with the nickname of " the most beautiful actress of film history, " a true reflection of how women are valued in the 50s of the last century. Because Hedy Lamarr was extraordinarily beautiful, true, and also a renowned actress. But also he possessed a gifted mind. He learned to engineer on their own and patented numerous inventions, including a carbonated beverage that was obtained with an effervescent tablet and an improvement in the operation of traffic lights.
In 1942, together with composer George Antheil, he patented a modulation technique spread - spectrum signals, the first version of what is known as frequency hopping. He wore a pair of perforated drums and synchronized to transmit information over the air, without wires. Although it was thought that the Nazi defenses could not intercept the drone torpedoes allies, this system was used as a remote to control marine buoys. It is the foundation on which all wireless data transmission systems, how they work WiFi or Bluetooth.
Hedy Lamarr received numerous awards for his inventions. On November 9, the day of his birth is celebrated in his honor the Day of Inventor in Austria, Germany, and Switzerland. A couple of years ago Google created a doodle to honor her in her 101st birthday:
We have seen how the Wi-Fi was created as a fusion of technologies developed by different individuals and organizations. Theoretically, using the same principles and protocols that cable connection. In other words, the transmission data is identical to the WiFi connection or Ethernet LAN, unless the cable is replaced by radio waves. Why a WiFi network can communicate with a LAN or Ethernet network directly.
The WiFi standard does is transform ones and zeros, the basic units of information in radio waves.
The router receives Internet via an Ethernet cable and converts the data into radio waves sent to the receiving device, equipped with a WiFi chip, which receives these waves and decodes to turn them into ones and zeros, data understand computers and mobile.
This WiFi chip also has the ability to convert data into radio waves and send them to the router. Here's how climbed Internet data.
Radio waves using WiFi are the same used by the mobile television channels, including microwave, but at a frequency (speed) greatly increased. In fact, the most frequently used WiFi 2.4 GHz, is the same as using the microwave, so sometimes there is interference.
Frequency is measured in Hertz or Hertz, which measures the rate at which the waves are transmitted. One hertz indicates one cycle per second, while a KHz is 1,000 Hertz. The WiFi transmitted in the bands 2.4 and 5 GHz, and since 1GHz are 1,000 million hertz, a router of 5 GHz is capable of transmitting 5,000 million of data per second.
The higher the frequency, they can transmit more data per second, but the scope is smaller.
The wifi routers emit at most 100mW, but pose a risk to the school population because of its proximity to children / as head especially in pediatric age, when developing brain and nervous system. The wireless systems send when there is data transfer. However, a better connection and the higher-speed wired connection is achieved. We should use the wifi as a last resort when you can not connect cable if absolutely necessary. should not be installed in or near the same bedrooms of children If issued with less power (on the order of 100mW, compared with 2W which is emitted by a mobile), however, many businesses and schools are emitted close of the person and his brain in a continuous and extensive time exposure in work environments or schools during school hours.
Wi-Fi antennas can be purchased online and therefore its radiation is more uncertain than that of mobile phone base stations. In practice, no one regulates these powers nor the number of users 'online', and anyone can set up a base station at home. A picture really chaotic considering their risks.
It is necessary therefore a moratorium on its implementation, at least in teaching centers, public libraries and universities and public buildings and their replacement, also in the workplace in the workplace, ADSL systems coaxial or fiber optic cabling.
The development of stricter control on levels of emission/absorption of antennas and wireless systems is a specific work of local, regional administrations and regional telecommunications inspections to avoid the chaotic proliferation which occurred earlier deployments phone networks mobile.