Win XP System Wireless network technology fully detailed

802.1x wireless network, I sound like a complex, to know what it is, first of all to understand what is a wireless network. The term wireless networks has become popular in recent years, and it has been involved in a wide range of areas, such as mobile communications, so what exactly is a wireless network?

Wireless network Overview

Wireless networking technologies range from global voice and data networks that allow users to establish remote wireless connections to infrared and radio frequency technologies optimized for short-range wireless connections. Devices typically used for wireless networking include laptops, desktops, handheld computers, personal digital devices (PDAs), mobile phones, pen computers, and pagers. Wireless technology is used for a variety of practical purposes. For example, a mobile phone user can use a mobile phone to access e-mail. Travellers using laptops can connect to the Internet by installing base stations in airports, stations and other public places. At home, users can connect to a desktop device to synchronize data and send files.

A Defining criteria

To reduce costs, ensure synergy and improve the wider use of wireless technology, many organizations (e.g. the Institute of Electrical and Electronic Engineers (IEEE), Internet Engineering Task Force (IETF), Wireless Ethernet Compatibility Alliance (WECA) and the International Telecommunication Union (ITU) ) have been involved in several major standardization efforts. For example, the IEEE workgroup is defining how information is transferred from one device to another (whether it uses radio waves or infrared light), and how and when to use transport media for communication. In the development of wireless network standards, some organizations, such as IEEE, focus on power management, bandwidth, security, and other projects with wireless network characteristics.

Two Wireless network Type

As with wired networks, wireless networks can be divided into several different types depending on the distance sent by the data.

1. Wireless wide Area network (Wwans)

WWAN technology enables users to establish a wireless network connection through a remote public or private network. Through the use of a number of antenna base stations or satellite systems maintained by wireless service providers, these connections can cover a wide geographical area, such as many cities or countries (regions). The current WWAN technology is known as the second generation (2G) system. The main 2G systems include global digital mobile phone system (GSM), network Digital packet Data (CDPD) and multiple access code partitioning (CDMA). Efforts are being made to transition from 2G networks, some with limited roaming capabilities and incompatible features, to third-generation (3G) technologies that will implement global standards and provide global roaming capabilities. The ITU is actively promoting the development of 3G global standards.

2. Wireless Urban Network (WMANS)

WMAN technology enables users to create wireless connections between multiple locations in major urban areas (for example, between an office building in a city and university campuses) without the costly cost of laying cables, cables and leased lines. In addition, WMANs can be used as a standby network for a wired network if the main leased line of the wired network is not available. WMANs can either use radio waves or use infrared light to transmit data. The demand for wireless access to network bandwidth, which provides users with high-speed access to the Internet, is growing. Although different technologies are being used, such as multiple-point distribution services (MMDS) and local multicast services (LMDS), the IEEE 802.16 broadband Wireless access standards Working Group is still developing specifications to standardize the development of these technologies.

3. Wireless local network (WLANS)

WLAN technology enables users to create a wireless connection locally (for example, in a company or campus building, or in a public place, such as an airport). WLANs can be used for temporary office or other cable installation Restricted sites, or for enhancing existing LANs, allowing users to work in different parts of the office at different times. WLANs can be run in two different ways. In the base WLANs, a wireless station (a device with a radio network card or an external modem) connects to a wireless access point, which acts as a bridge between the wireless station and the existing network hub. For Peer-to-peer Special WLANS, a temporary network can be established without access points if you do not need access to network resources in several users in a limited area, such as a conference room.

IEEE approved the 802.11 WLANs standard in 1997 with a specified data transfer speed of 1 to 2 megabytes per second (Mbps). In the 802.11b, which is becoming the new primary standard, the maximum speed of data transmission through the 2.4 GHz (gigahertz) band is one Mbps. Another updated standard is 802.11a, which specifies that the maximum speed of data transmission through the 5 GHz band is "Mbps".

4. Wireless personal area Network (WPANs)

WPAN technology enables users to create special wireless communications for devices (such as PDAs, mobile phones, and laptops) for personal operating space (POS). POS is the space around the individual, within 10 meters of the distance. Currently, two major WPAN technologies are Bluetooth and infrared light. Bluetooth is an alternative technology that uses radio waves to transmit data within 30 feet. Bluetooth data transmission can penetrate walls, pockets and briefcase. Bluetooth technology is guided by the Bluetooth special Interest Group (SIG) development. The group released a 1.0 version of the Bluetooth specification in 1999. However, to connect devices at close range (less than one meter), users can also create infrared links.

In order to standardize the development of WPAN technology, IEEE has set up 802.15 working groups. The Working Group is developing a WPAN standard based on the 1.0 version of the Bluetooth specification. The main objectives of the draft standard are low complexity, low energy consumption, strong interactivity, and compatibility with 802.11 networks.