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- Post Publish: 2023-03-07
- Categories: Knowledge
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- Posts by Mina Xiao
Understanding Wi-Fi: A Beginner’s Guide
Mina Xiao
Understanding Wi-Fi: A Beginner’s Guide - Table of contents:
Wi-Fi technology enables wireless networking between different devices, including computers, mobile phones, printers, and video cameras. This wireless communication allows these devices to access the internet and share information with each other, creating a seamless network of connected devices. As long as your devices are equipped with wireless capabilities and in range of a Wi-Fi signal, you can enjoy fast and convenient internet access wherever you go.
Play Video about Understanding Wi-Fi
Internet connectivity occurs through a wireless router. When you access Wi-Fi, you are connecting to a wireless router that allows your Wi-Fi-compatible devices to interface with the Internet.
What is Wi-Fi?
Wi-Fi, also known as “Mobile Hotspot” in Chinese, is the trademark of the manufacturer of the Wi-Fi Alliance as a brand certification of the product and is a wireless local area network technology based on the IEEE 802.11 standard. Based on the close relationship between the two systems, some people often regard Wi-Fi as a synonym for the IEEE 802.11 standard. “Wi-Fi” is often written as “WiFi” or “Wifi”, but these are not endorsed by the Wi-Fi Alliance.
Not every product that matches IEEE 802.11 applies for Wi-Fi Alliance certification, and the relative lack of Wi-Fi certification does not necessarily mean that it is not compatible with Wi-Fi devices.
IEEE 802.11 devices have been installed in many products on the market, such as personal computers, game consoles, MP3 players, smartphones, tablet computers, printers, notebook computers, and other peripheral devices that can access the Internet wirelessly.
Wireless network refers to “wireless compatibility certification” in the category of wireless local area network, which is essentially a commercial certification and also a wireless networking technology. In the past, computers were connected through network cables, while Wi-Fi was connected through radio waves. The common one is a wireless router, so the effective range of radio wave coverage of this wireless router can be connected to the Internet through a Wi-Fi connection. If the wireless router is connected to an ADSL line or other Internet lines, it is also called a hotspot.
Wi-Fi major version
With the release of the latest 802.11 ax standard, the new Wi-Fi standard name will also be defined as WiFi6, because the current 802.11 ax is the sixth-generation WiFi standard, and the WiFi Alliance will use the original 802.11 a/b/g/ The ax standard after n/ac is defined as WiFi6, so the previous 802.11 a/b/g/n/ac can also be added as WiFi1/2/3/4/5 in turn.
The 2.4GHz frequency band supports the following standards (802.11b/g/n/ax), and the 5GHz frequency band supports the following standards (802.11a/n/ac/ax). It can be seen that 802.11n/ax works in the 2.4GHz and 5GHz frequency bands at the same time. So these two standards are compatible with dual-frequency work.
| WiFi version | WiFi standard | Release time | Maximum rate | Working frequency |
|---|---|---|---|---|
| WiFi 7 | IEEE 802.11be | 2022 | 30Gbps | 2.4GHz，5GHz，6GHz |
| WiFi 6 | IEEE 802.11ax | 2019 | 11Gbps | 2.4GHz or 5GHz |
| WiFi 5 | IEEE 802.11ac | 2014 | 1Gbps | 5GHz |
| WiFi 4 | IEEE 802.11n | 2009 | 600Mbps | 2.4GhHz or 5GHz |
| WiFi 3 | IEEE 802.11g | 2003 | 54Mbps | 2.4GHz |
| WiFi 2 | IEEE 802.11b | 1999 | 11Mbps | 2.4GHz |
| WiFi 1 | IEEE 802.11a | 1999 | 54Mbps | 5GHz |
| WiFi 0 | IEEE 802.11 | 1997 | 2Mbps | 2.4GHz |
| 2.4GHz（802.11b/g/n/ax），5GHz（802.11a/n/ac/ax） |
Main functions of Wi-Fi
Wi-Fi Internet access can be simply understood as wireless Internet access. Almost all smartphones, Wifi digital photo frame, and notebook computers support Wi-Fi Internet access. It is the most widely used wireless network transmission technology today.
In fact, it is to convert the wired network signal into a wireless signal, just as I introduced at the beginning, using a wireless router to receive it for related computers, mobile phones, tablets, etc. that support its technology. If the mobile phone has a Wi-Fi function, when there is a Wi-Fi wireless signal, you can surf the Internet without going through the Mobile Unicom network, saving traffic charges.
Wireless networks and wireless Internet access are commonly used in big cities. Although the quality of wireless communication transmitted by Wi-Fi technology is not very good, the data security performance is worse than that of Bluetooth, and the transmission quality needs to be improved, but the transmission speed is very fast and can reach 54Mbps. Personal and social information needs. The main advantage of Wi-Fi is that it does not require wiring and is not limited by wiring conditions, so it is very suitable for mobile.
Application field
Internet media
Since the frequency band of the wireless network does not require any telecommunication operating license in the world, the WLAN wireless device provides a wireless air interface with extremely low cost and high data bandwidth that can be used worldwide. Users can quickly browse the web within the Wi-Fi coverage area, and answer and make calls anytime, anywhere. And some other broadband data applications based on WLAN, such as streaming media, online games, and other functions are worth looking forward to by users.
With the Wi-Fi function, we can make long-distance calls (including international calls), browse the web, send and receive emails, download music, transfer digital photos, etc., without worrying about slow speed and high cost. Wi-Fi technology, like Bluetooth technology, is a short-range wireless technology used in offices and homes.
Handheld device
Wireless networks are increasingly used on handheld devices, and smartphones are one of them. Different from the Bluetooth technology applied to mobile phones earlier, Wi-Fi has a larger coverage area and higher transmission rate, so Wi-Fi mobile phones have become a fashion trend in the mobile communication industry in 2010.
Daily leisure
In 2010, the coverage of wireless networks became more and more extensive in China, and areas such as high-end hotels, luxury residential areas, airports, and coffee shops all had Wi-Fi interfaces. When we travel and work, we can use our handheld devices to surf the Internet to our heart’s content. Manufacturers only need to set up “hot spots” in densely populated places such as airports, stations, coffee shops, libraries, etc., and connect the Internet to the above-mentioned places through high-speed lines.
In this way, since the radio waves emitted by the “hot spot” can reach a place with a radius of tens of meters to 100 meters from the access point, the user only needs to bring a Wi-Fi-enabled laptop or PDA or mobile phone or PSP or iPod touch to the area You can access the Internet at high speed.
You can also buy a wireless router at home to set up a LAN, and then you can enjoy wireless Internet access.
The difference between the wireless network and 3G technology is that 3G has better transmission quality when moving at high speed, but it is enough to use Wi-Fi to surf the Internet when it is static.
The large-scale commercial application of wireless networks is a rare successful precedent in the world. The problem is concentrated in two aspects: one is that large operators do not recognize this model; the other is the lack of an effective business model. However, the wireless local area network based on wireless network technology has become more and more popular, which means that it will be very convenient to apply in the future.
Once there is a Wi-Fi network in public places, the problems of interconnection, high charges, and roaming of operators are solved, and Wi-Fi will be transformed from a successful technology into a successful business in the future.
Passenger train
At 14:20 on November 28, 2014, China’s first passenger train with WiFi service, the through train T809 from Guangzhou to Kowloon, Hong Kong, departed from Guangzhou East Railway Station, marking the beginning of the WiFi (wireless network) era for Chinese railways.
After the train Wi-Fi is enabled, not only can you watch high-definition theaters on the LAN inside the train, and play community games, but also directly access the external network, browse Weibo, send emails, and connect with the world at a bandwidth speed of 10-50 megabytes.
Turn on & connect
1. Open your device’s Settings app.
2. Tap Network & internet. Internet.
3. Tap a listed network. Networks that require a password have a Lock.
Wi-Fi is a wireless signal used to connect devices. The Wi-Fi signal normally connects you to the Internet, but that isn’t always the case. WiFi connects you to the Internet when its signal is being transmitted from a device (typically a router) that is plugged in with an ethernet cable.
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