The range that wireless LAN can cover is about 300m under barrier-free conditions; the essential characteristic of wireless LAN is that it no longer uses communication cables to connect computers and networks, but uses wireless methods connection, thereby making network construction and terminal movement more flexible.
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The range that wireless LAN can cover, in the barrier-free In this case, it is about 300m.
WLAN is the abbreviation of Wireless Local Area Network, which refers to the application of wireless communication technology to interconnect computer devices to form a network system that can communicate with each other and realize resource sharing. The essential characteristic of wireless LAN is that it no longer uses communication cables to connect computers to the network, but connects wirelessly, making network construction and terminal movement more flexible.
It is a very convenient data transmission system. It uses radio frequency (Radio Frequency; RF) technology and electromagnetic waves to replace the old and cumbersome local area network composed of twisted pair copper wires (Coaxial), and conducts transmission in the air. Communication connection enables wireless LAN to use a simple access structure to allow users to achieve the ideal state of "portable information and convenient travel around the world".
Before the invention of wireless local area network (WLAN), if people wanted to contact and communicate through the network, they must first use physical cables-copper strands to form an electronic operation channel. In order to improve efficiency and speed, the invention was later invented optical fiber. When the network developed to a certain scale, people discovered that it was very difficult to set up, disassemble, and re-layout and reconstruct this wired network on the original basis, and the cost and price were also very high. Therefore, the WLAN networking method It came into being.
WLAN started in 1997. In June of that year, the first wireless LAN standard IEEE802.11 was officially promulgated and implemented, providing a unified standard for wireless LAN technology, but the transmission rate at that time was only 1~2 Mbit/s. Subsequently, the IEEE committee began to formulate new WLAN standards, named IEEE802.11a and IEEE802.11b respectively. The IEEE802.llb standard was first officially promulgated in September 1999, with a rate of 11 Mbit/s. The improved IEEE802.11a standard was officially promulgated at the end of 2001. Its transmission rate can reach 54 Mbit/s, which is almost 5 times that of the IEEE802.llb standard. Despite this, the application of WLAN has not really started because the entire WLAN application environment is not mature.
The real development of WLAN started in March 2003 when Intel launched the Centrino processor with a WLAN wireless network card chip module for the first time. Although the wireless network environment at that time was still very immature, the United States, the most developed country, was no exception. However, due to Intel's bundled sales and the obvious advantages of Centrino chips such as high performance and low power consumption, many wireless network service providers have seen business opportunities. At the same time, the access rate of 11 Mbit/s can also be used in ordinary small LANs. For some daily applications, wireless network service providers in various countries began to provide access hotspots in public places (such as airports, hotels, coffee shops, etc.). In fact, they arranged some wireless access points (Access Points, APs) to facilitate wireless business people. Go online.
After more than two years of development, wireless network products and applications based on the IEEE802.llb standard have become quite mature, but after all, the access rate of 11 Mbit/s is far from meeting the application needs of actual networks.
In June 2003, after more than two years of development and multiple improvements, a new standard that is compatible with the original IEEE802.llb standard and can also provide an access rate of 54 Mbit/s - IEEE802. 11g was officially released due to the efforts of the IEEE committee.
The most commonly used standards at present are 802. 11n (fourth generation) and 802. 11ac (fifth generation) standards. They can work in both the 2.4 GHz frequency band and the 5 GHz frequency band, and the transmission rate can be Up to 600 Mbit/s (theoretical value). But strictly speaking, only those that support 802.11ac are real 5G. Nowadays, many routers that support 2.4G and 5G dual-band actually only support the fourth-generation wireless standard, which is the dual-band of 802.11n. The cheapest router that truly supports ac5G costs four to five hundred yuan or even thousands of yuan.
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