Basic knowledge of wireless Internet access

The basic knowledge of wireless Internet access is the focus of this article. We will give a detailed introduction to some of its basic standard parameters. If you have recently visited airports, coffee shops, libraries, or hotels, you must have had the chance to use wireless networks. Many people also use wireless networks, also known as WiFi or 802.11 networks, to connect their computers at home. More and more cities use this technology to provide free or low-cost Internet access for residents. In the near future, wireless networks may become very popular. You can even access the internet anytime and anywhere without using wires.

Wireless Internet access has many advantages. Wireless Networks are easy to establish and cost-effective. They are also inconspicuous. Unless you are looking for a place to use a portable computer, you will not even notice that you are in a hot spot. In this article, we will focus on the technology that can transmit information through radio. We will also look at everything we need to build wireless networks at home.

A wireless router connects multiple devices to the Internet.

First, we will introduce some basic knowledge about wireless Internet access. Wireless networks use radio waves like mobile phones, TVs, and radios. In fact, the process of communication through a wireless network is very similar to two-way radio communication. The specific process is as follows:

The wireless adapter of the computer converts the data into a radio signal and sends it out using an antenna.

The wireless router receives the signal and decodes it. It sends the information to the Internet through a wired physical Ethernet connection.

This process can also be executed in turn, that is, the router receives information from the Internet, converts it into a radio signal, and sends it to the computer's wireless adapter.

PC wireless card photo courtesy URL title; the USB wireless adapter is provided by HowStuffWorks Shopper, and the PC wireless adapter is provided by HowStuffWorks Shopper.

The wireless adapter can be inserted into the PC Card slot or USB port of the computer.

The radio for wireless network communication is very similar to that for wireless phones, mobile phones, and other devices. They can send and receive radio waves, convert 1 s and 0 s to radio waves, and convert the radio waves back to 1 s and 0 s. However, there are some notable differences between wireless network radio and other radio:

They send signals at a frequency of 2 to 4 GHz or 5 GHz. This frequency is much higher than that of mobile phones, phones, and TVs. The higher the frequency, the more data the signal carries. They use the 802.11 Network standard and have multiple versions:

802.11b is the first version available on the market. It is the slowest but cheapest standard. As faster standards become increasingly cheaper, it has fewer and fewer applications. 802.11b sends signals within the 2.4 GHz band of the radio spectrum. It can process up to 11 MB of data per second, and uses the Supplementary Code keycodes (KMS) for encoding.

802.11g also sends signals at GHz, but it is much faster than 802.11b. It can process up to 54MB of data per second. 802.11g is faster because it uses orthogonal division multiplexing (OFDM), which is a more effective coding technology.

802.11a sends signals at 5 GHz and can move up to 54MB of data per second. It also uses OFDM encoding. Updated standards such as 802.11n can be even faster than 802.11g. However, the 802.11n standard is not the final standard.

Radio Networks can send signals in any three frequency bands. They can also quickly "Skip" between different frequencies ". Frequency Hopping helps reduce interference and allows multiple devices to use the same wireless connection at the same time.

You may want to know why people call Wi-Fi 802.11. 802.11 this title is from the IEEE of the Institute of Electrical and Electronics Engineers ). IEEE sets standards for a series of technical protocols and classifies them using a numbering system.

As long as there are wireless adapters, multiple devices can use one vro to connect to the Internet. This connection is convenient and almost invisible and stable. However, if the router fails or the user attempts to use a high-bandwidth application too many times, the user may experience interference or lose connection.

The above is an introduction to the basic knowledge of wireless Internet access, and I hope to help you.