Recently, a post on Weibo about 5G is widely spread, and it has caused a lot of controversy. Many netizens asked: "Isn't 4G networks still in trial business, how can 5G become popular? "And the news also said that many hot-selling smartphones such as iPhone 5 and Xiaomi mobile phone 2S have already supported 5G technology. This makes some netizens feel even more strange. The network is still not there. How do these phones support it? What? After investigating and inquiring about relevant technical experts, the original 5G is not an upgraded version of the 5G for mobile communication networks, but an upgraded version of WiFi technology, specifically referring to the latest WiFi wireless transmission standard supporting the 5GHz band. Let me give you a detailed introduction to the mystery of this 5G. 5GHz WiFi is really here. Want to know what is 5G WiFi? First of all, you may want to explain to you the origins of WiFi technology. As we all know, WiFi is just a commercial brand representation of wireless LAN technology. It has another name as an industry technical standard. The standardization of the first generation of WiFi technology is actually 802.11a, which was first used by IEEE (American Institute of Electrical and Electronics Engineers). Developed in 1997, mainly to enable universal and compatible wireless network products of different brands. In the following 20 years, the IEEE has upgraded the 802.11x technology standard several times. During the period, there have been multiple versions of 802.11a, 802.11b, 802.11g, 802.11n, etc. The biggest difference between these versions is the constant speed. Enhancements and signal coverage continue to expand. For example, the 802.11n introduced in 2004 is 10 times faster than the previous 802.11g, 50 times faster than the earlier 802.11b, and the coverage is wider. In the process of commercialization of the entire 802.11x technology standard, in order to facilitate the promotion, some related manufacturers organized an industry alliance, and in 2000 changed its name to "WiFi" alliance, and used WiFi as a trademark to promote wireless LAN technology, and finally The average consumer only knows that WiFi does not understand the history of 802.11x behind it. In 2012, IEEE's 802.11x technology standard was upgraded to the latest 802.11ac version. Unlike previous versions, 802.11ac first supported the 5GHz band, while the previous four-generation technology standard used 2.4 for signal wireless transmission. GHz band. It is worth mentioning that this standard upgrade is just the fifth generation upgrade of 802.11x technology, and it just joined the 5GHz band support, so 802.11ac is also referred to as 5G WiFi by non-industry people, so there are network rumors to use this 5G. It was misreported that the 5G jokes of the fifth generation mobile communication technology appeared. 5GHz WiFi has many benefits So why is the IEEE going to introduce 802.11ac technology that supports the 5GHz band? There are a lot of reasons for this, but the simplest is because 5G WiFi is faster and the network is smoother. I believe that many mobile phone WiFi users have encountered too many hot spots, network congestion, frequent dropped calls, and too weak signals when using public WiFi. The reason for this situation is actually very simple, that is, there are too many WiFi devices today. According to the statistics of the WiFi Alliance, at present, there are more than 1 billion WiFi users worldwide, and the total number of products with WiFi authentication has exceeded 20. With an average of 2 million pieces per year. At the same time, the demand for Internet access is also changing. Sending and receiving emails and browsing websites is only the most basic. People also want to watch movies, play games, listen to music, and process various data. But the world's fastest WiFi transmission speed is only 300Mbps (a few can reach 600Mbps), which is equivalent to only about 36MB of content per second. This is fine when people only use it to look at websites and process mail. But today, in the face of increasingly complex use requirements, the old technical standards have become stretched. Because this was originally a road that was expected to pass through a car, it suddenly flooded into passenger cars and large trucks, and the number was increasing. 5G WiFi - the fifth generation of WiFi solves this problem. It boosts the transfer speed to 1 Gbps and can transfer about 125 MB of content per second. For example, in a high-definition movie with the highest transmission bandwidth requirements, the data stream per second for a high-definition movie is usually between 30-45MB or even higher. 5G WiFi not only satisfies the transmission conditions, but also the transmission of multiple HD movies is not a problem. It also means that it can accommodate more users without causing congestion due to too many numbers. It is understood that the new 5G WiFi, also known as 802.11ac, uses a chip with a working frequency of 5 GHz and can cover both the 5 GHz and 2.4 GHz bands. In addition to being faster, it also improves the problem of small wireless signal coverage. Although 5GHz is more difficult to bypass obstacles than 2.4GHz, the new standard will be easier to make due to the larger coverage and the refraction of the signal. Signals are received in every corner; another major advantage of the new standard is energy efficiency, which is six times more efficient than the previous generation. Since more content is transferred at the same time, the device can also enter the low power power saving mode more quickly. With faster throughput and more comprehensive coverage, 5G WiFi has become a veritable information superhighway. Today, mobile Internet terminals are popular, which means that this network has more possibilities in the future. Future WiFi will also achieve international roaming However, 5G WiFi is not the end of the development of WiFi technology. According to the reporter, the WiFi Alliance actually has a bolder plan: gradually adopting the mature conditions of increasing bandwidth, speed and number of hotspots to gradually promote WiFi international roaming services. The plan will be divided into two steps: to promote 5G WiFi, to ensure bandwidth, and to launch a new technology called "WiFi CERTIFIED", which allows mobile devices such as mobile phones to automatically receive calls and download data in the WiFi network of the country where the user is located. No need to apply and set up in advance; the second step is longer, through the planned 60GHz WiFi technology - allowing the WiFi network to transmit several Gigabytes of content per second, further enabling seamless global roaming between WiFi products. In fact, this dream, Apple founder Jobs has also had. As early as 2005, he proposed to use the ubiquitous WiFi hotspot to make Apple a "WiFi communication operator" independent of existing mobile operators. Nowadays, the iMessage and FaceTIme products available on the iPhone are not difficult to see. Today, the WiFi Alliance has further elevated this vision to "seamless connectivity," meaning that WiFi networks will be as convenient as mobile communications networks. Just like when we turn on the mobile phone, the mobile phone will automatically access the communication network. In any future, the WiFi network can be automatically accessed. The signal is more stable and faster. It can not only make calls, but also watch high-definition video on the Internet and process those. Complex data. The launch of 5G WiFi is an important step towards realizing this vision. Cable Tray bend is one kind of cable tray accessories.It can connect cable trays when you need them to change directions in vertical
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