802.11

How Wi-Fi works

There is no doubt that one of the most widespread technologies of recent times, and faster has been adopted to encompass virtually all facets of the user’s life, is known as Wi-Fi, technology that allows us to interconnect different types of devices without wires, avoiding the need for devices fixed in one place. In this article we will learn a little more of this technology to better understand all the advantages that we can offer Wi-Fi.

How WiFi works

Introduction

In a basic explanation, the Wi-Fi wireless links are a connection methodology that allows us to interconnect devices and access the Internet without using cables or complicated configurations, allowing mobility and simplicity of use is unprecedented in the history of computing.

Nowadays, it is almost an obligation that the new devices coming to market offers a connection of this type, which is why we can find Blu-Ray or DVD equipment, and home entertainment such as game consoles, as well as smartphones, tablets or smartphones, in addition to laptops or desktop and many others devices.

The possibility of a wireless connection gives incredible flexibility to these devices for interconnect with other devices, fact that opened the way to other technologies born from this concept as the smart TVs.

How WiFi works

It’s amazing that a simple Internet connection via Wi-Fi can increase the usability even a small media player, adding features and functions unthinkable years ago. Just look at some of the new models come out on the market recently to realize the possibilities it offers.

Technical data

The Wi-Fi technology is based on the IEEE 802.11 standard, however, it does not mean that any product that works with these specifications is Wi-Fi. For a particular product received a seal with this brand, it needs to be assessed and certified by the Wi-Fi Alliance.

This is a way to assure the user that all products with Wi-Fi Certified seal follow the rules of functionality that ensures compatibility with each other. However, that does not mean that devices that do not have the stamp may not work with devices that they do have this seal (but it is preferable to opt for certified products to avoid problems). The base of Wi-Fi is in the 802.11 standard. Here we explain a little more this technology.

How WiFi works

802.11 Standard

The 802.11 specification establishes standards for creating and using wireless networks. The transmission of this network is by radio frequency signals that propagate through the air and can cover areas of hundreds of square meters. As there are countless services that can use radio signals, it is necessary that each operate in accordance with the requirements established by the government of each country. This is a way to avoid problems, especially with interference.

There are, however, some frequency segments that can be used without the direct approval of appropriate each government entities: the bands ISM (Industrial, Scientific and Medical), which can operate, among others, the following intervals:

  • 902 MHz – 928 MHz; 2.4 GHz
  • 2.485 GHz and 5.15 GHz – 5.825 GHz

Notably, depending on the country, these limits may vary. The last two fringe are used by the Wi-Fi, however, this feature may vary according to the version of the 802.11 standard.

It is good to know that, for a network of this type is established, it is necessary that the devices (also called STA – of “station”), they must be connected to devices that provide access.

How WiFi works

These are generically called Access Point (AP). When one or more STA connected to an AP, is obtained a network, which is called a Basic Service Set (BSS). For security and the possibility to be more of a BSS in a certain place (for example, two wireless networks created by different companies in an area event), it is important that each receives an exclusive ID, called Service Set Identifier (SSID), a character set that after defined, is inserted into each data packet network. In other words, the SSID is simply the name given to each wireless network.