At the beginning of the development of the Internet, the network was connected with a network cable, which had to be carried out in the room in such a way that it did not interfere. He was fastened and hidden as best they could. Old computer furniture still has cable holes.
When wireless technologies and Wi-Fi networks became popular, the need to run a network cable and hide it disappeared. Wireless technology allows you to get the Internet "over the air" if you have a router (access point). The Internet began to develop in 1991, and closer to 2010 it has already become especially popular.
What is Wi-Fi
It is a modern standard for receiving and transmitting data from one device to another. In this case, the devices must be equipped with radio modules. Such Wi-Fi modules are part of many electronic devices and equipment. At first, they were included only in a set of tablets, laptops, smartphones. But now they can be found in cameras, printers, washing machines, and even multicooker.
Seti Wi-Fi 1
Principle of operation
To access Wi-Fi, you need an access point. Today this point is mainly a router. This is a small plastic box, on the body of which there are several jacks for connecting the Internet via a wire. The router itself is connected to the Internet via a network wire called a twisted pair. Through the antenna, the access point distributes information from the Internet to the Wi-Fi network, through which various devices that have a Wi-Fi receiver receive this data.
Instead of a router, a laptop, tablet or smartphone can work. They must also have a mobile internet connection via a SIM card. These devices have the same communication principle as a router.
The method of connecting the Internet to the access point does not matter. Access points are divided into private and public. The former are used only for use by the owners themselves. The latter give access to the Internet for money, or for free to a large number of users.
Seti Wi-Fi 2
Public spots (hotspots) are most often found in public places. It is easy to connect to such networks, being on the territory of this point, or near it. In some places, it requires you to log in, but you are offered a password and login if you use the paid services of this institution.
In many cities, their entire territory is completely covered by a Wi-Fi network. To connect to it, you need to pay for a subscription, which is not expensive. Consumers are provided with both commercial networks and free access. Such networks are being built by municipalities and individuals. Small networks for residential buildings, public institutions become larger over time, use a peer-to-peer agreement to interact freely with each other, work on volunteering and donations from other organizations.
City authorities often sponsor similar projects. For example, in France, some cities provide unlimited Internet access to those who give permission to use the roof of a house to install a Wi-Fi antenna. Many universities in the west allow online access to students and visitors. The number of hot spots (public points) is growing steadily.
Wi-Fi standards: what does wlan stand for
IEEE 802.11 - protocols for low data rates, the main standard.
IEEE 802.11a - not compatible with 802.11b, for high speeds, uses 5 GHz channels. The ability to pass data up to 54 Mbps.
IEEE 802.11b is a standard for fast speeds, 2.4 GHz channel frequency, bandwidth up to 11 Mbps.
IEEE 802.11g - the speed is equivalent to the 11a standard, the channel frequency is 2.4 GHz, it is compatible with 11b, the bandwidth is up to 54 Mbps.
IEEE 802.11n - the most advanced commercial standard, 2.4 and 5 GHz channel frequencies, can work in conjunction with 11b, 11g, 11a. The highest speed of work is 300 Mbps.
To get a closer look at how various wireless standards work, consider the information in the table.
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