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I Know The Wireless Wi-Fi Network
I Know The Wireless Wi-Fi Network

I Know The Wireless Wi-Fi Network

I Know The Wireless Wi-Fi Network

I Know The Wireless Wi-Fi Network, Despite the fact that the wireless Wi-Fi networks have become part of our lives and most of us use them every day, simple user is very easy to get lost in a variety of terms and definitions. In this article we will try to expose the main ones, as well as available to talk about standards, encryption methods and modes of operation of such networks.

I Know The Wireless Wi-Fi Network
I Know The Wireless Wi-Fi Network

Basic Concepts

Before you start, take a look at the main terms used in this article:
Authentication – User authentication when connecting to an access point. Most often it has done with the help of the entered password, but there are other ways, for example by filtration MAC-address.
MAC-address – physical address of a device attached to its network module.
SSID – SSID of the wireless network, its name used for the detection of other devices. SSID broadcasting can be turned off, then the connection to the Wi-Fi will need to be entered manually.
BSSID – MAK address of the access point.

The IEEE 802.11 Standard

Among the technical characteristics of any modern smartphone, tablet, and often other gadgets, you can see a line like: «Wi-Fi 802.11a / b / g / n». Let’s see what kind of information contains such a designation.

A huge number of standards from the field of radio and electronics was developed and maintained by a nonprofit organization IEEE (Institute of Electrical and Electronics Engineers). The name of the institute read as I triple E («triple and ah”). Among nearly a thousand of the IEEE there is a whole family of devoted local area networks – IEEE 802. In turn, the family of IEEE 802 is divided into subfamilies, one of which – IEEE 802.11, – entirely devoted to wireless networks.

These networks are commonly known under the brand name Wi-Fi (the English Wireless Fidelity – «Wireless clarity”), which was proposed and promoted by combining Wi-Fi Alliance. Thus, we can assume that the notation Wi-Fi and IEEE 802.11 in most cases equal. It remains to understand what value are the letters, which are usually listed after the slash mark after the number of standards.

I Know The Wireless Wi-Fi Network

IEEE 802.11a . In fact, each letter along with family, for example, IEEE 802.11a is a separate standard. Generally, letters are assigned in alphabetical order of the standards as they are developed, so you can easily determine which one is newer. The first of the high standards just above 802.11a was presented in 1999 (however, the first device of its support came only in 2001), operating at a frequency of 5 GHz and up to 54 Mbit / s.

IEEE 802.11b . Along with 802.11a was presented and 802.11b, but despite the letter, he was only an extension of the original 802.11, and supports speeds up to 11 Mbit / s at a frequency of 2.4 GHz.

IEEE 802.11g . In 2003, represented a backward-compatible with 802.11b standard 802.11g, which enabled devices to exchange information at speeds up to 54 Mbit / s at a frequency of 2.4 GHz.

IEEE 802.11y . It does not spread to Russia and Europe, but is used in the United States. Significantly different from the others in that it operates at a frequency of 3.6 GHz, which can increase the range of up to 5 km at a speed of 54 Mbit / s.

IEEE 802.11n . The above standards are given a good impetus to the development of wireless Wi-Fi networks, but at the moment they are considered obsolete and each year are used less, though backward compatible with 802.11a / b / g and now keeps most of the equipment. To date, the most common and universal standard is considered submitted in 2009 802.11n. This standard is applicable to both networks at a frequency of 2.4 GHz and 5 GHz, with theoretically is capable of data rates up to 600 Mbit / s when using technology MIMO, which involves the use of multiple antennas to simultaneously transmit and receive data.

IEEE 802.11as . Recently (officially adopted in early 2014) began to implement the new standard in device Wi-Fi – 802.11ac, which is at a frequency of 5 GHz and MIMO-eight antennas can provide speeds up to 6.77 Gb / s. While the IEEE 802.11ac do not support a lot of devices, but constantly come out with new gadgets and network equipment with its support.

I Know The Wireless Wi-Fi Network

IEEE 802.11ad . Finally, we mention the latest development of the IEEE and the Wi-Fi Alliance – Standard 802.11ad. It is expected that thanks to him, the baud rate will reach 7 Gb / s. Work related equipment will be at a frequency of 60 GHz, which will entail significant physical limitations: the appropriate length radio waves can not penetrate through the walls and the range of action of the network will be limited to one room. 802.11ad will be used for monitors and wireless transmission of large amounts of data such as media files to the player, and if you need a wireless connection at a greater distance, the access point will be switched to operate at frequencies in the 2.4 / 5 GHz.

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