Bluetooth, Wi-Fi and Wimax: Know the Wireless Technologies

Meet key wireless technologies that allow you to connect computers, mobile phones and other devices over short, medium and long distances. Bluetooth Bluetooth (IEEE 802.15.1) is a wireless standard for personal area networks. With a limited range, it is used to connect PDAs, mobile phones, laptops, PCs, printers and digitas cameras a short radio frequency and low power consumption. The technology provides wireless connection to a range that can be one meter ( class 1), 10 meters (class 2) – which is the most common – or 100 meters (class 3). Among the most common applications of the technology are wireless headphones connection to mobile phones and peripherals (such as mice, keyboards and printers) and mobile devices (phones and PDAs) to your computer. But Bluetooth can also be used in wireless controllers for video games and computer connections to the computer, which do not require large bandwidth capacity. Another application that is becoming common is the use of technology in phones for voice over IP (VoIP), allowing use of the broadband connection from the PC to make calls with the freedom of movement. One of the Bluetooth advantages is that two or more devices with technology recognize and “talk” automatically dispensing settings and connection procedures. A device automatically assumes the role of “master” and can connect to up to seven “slaves” assets. Some devices – such as mobile phones, PDAs and notebooks – come equipped with Bluetooth.

Others, such as your computer can use adapters to become compliant. In the case of PC, just plug in a USB adapter so that it can integrate with other Bluetooth devices. Once connected, the devices can be used to execute commands (in the case of controls and peripherals), exchange files (such as photos and music) and synchronize data (the computer agenda for the phone book, for example).   But the technology faces challenges with regard to security. It is through the Bluetooth connection that viruses are coming to mobile. Devices with the Symbian operating system receiving malicious code through technology, although the virus can only be installed if the user authorize. It has also been proven that it is possible to break into the connections, exposing the devices connected to hacker attacks. Wi-Fi  (short for Wireless Fidelity, according to is a classification assigned to a set of equipment which enable wireless LAN (also known as WLAN, English wireless Local Area Network). Initially created to allow wireless devices to communicate with networks connected by cables, now the Wi-Fi is primarily used to allow access these same devices to the internet. The technology also enables communication between desktops, eliminating the smashing walls to connect the computers. Some equipment – such as laptops, PDAs and mobile phones – bring embedded Wi-Fi feature. Others, such as PC, need adapters to communicate in standard.

Typically, using a router or access point connected to a PC with Internet connection to establish the wireless network, distributing web access within a limited space. A typical Wi-Fi router allows covering a distance of 45 meters indoors and 90 meters outdoors. But you can create multi – point networks to ensure greater coverage area (known as Wireless Mesh Networks). There are a number of projects around the world that aims to ensure coverage of entire cities with wireless access. . This is the case in Grand Haven, Michigan, the first US city to rely on Wi-Fi throughout its territory is also the Wi-Fi technology that allows access to wireless internet in public places – called hotspots – as Internet cafes, airports, hotels, etc. the Wi-Fi devices operate at different frequencies, standardized by the IEEE (Institute of Electrical and Electronics Engineers). the currently approved standards are 802.11a, which operates in the 5 GHz frequency and reaches speed 54 Mbps (megabits per second); 802.11b, which has speed of 11 Mbps and operates in the 2.4 GHz frequency; and 802.11g, which also operates at 2.4 GHz, but has 54Mbps. Also a standard security update is created, 802.11i, which includes the new AES protocol (Advanced Encryption System), which provides greater protection. the IEEE 802.11 committee group works still in defining the new 802.11n standard, which is the second version of “draft”. The pattern can reach potentially 540 Mbps transfer rate – which is 50 times faster than 802.11b and 10 times faster than 802.11a and 802.11g. Intel has already incorporated the new standard to its mobile platform Centrino. WiMax theory, WiMax can be considered a technological evolution of the popular Wi-Fi. Technically, however, the communication standard is kilometers away from Wi-Fi. The protocol 802.16, technical name of WiMax, allows to reach a much larger coverage area – a distance of 50 kilometers – and speed up to 70 Mbps. The speed signal potential to allied traffic allows a single antenna WiMax provides wireless broadband to around 60 home users with DSL connections – like the one you use at home to get on the web. In a region with obstacles such as buildings and landforms, the range drops to about 15 kilometers. The standard has two versions. One (802.16d) approved since 2004 is known as fixed pattern, which allows access only when the machine is stopped. But he already has a rival, approved in early 2006, 802.16e, known as mobile standard, which will allow access to be maintained even with moving devices.