(With the development of mobile data services, while receiving high-quality voice communication services, everyone also hopes to access the Internet, watch video programs, and play online games anytime and anywhere. Although the mobile communication technology entered the 3G era, the bandwidth has been greatly improved compared with the 2G era, but it is still unable to cope with the large bandwidth needs of multimedia services; at the same time, fixed broadband users are still unable to get rid of the entanglement of cables. Unable to enjoy the fun of free access. Neither of them can bring ideal mobile data service experience to the vast number of users. WLAN can effectively manage the 2G/3G bandwidth pressure of users' densely populated addresses with its own technical advantages of high bandwidth, low cost, and roaming, bringing customers a better experience; at the same time, it can flexibly extend fixed broadband networks to promote The organic integration of Internet and mobile services; it can also be used to manage broadband access problems for users in villages and towns with difficult wiring. The growth of WLAN technology began in the mid-1980s, and its technical specifications were mainly formulated by the IEEE802.11 office group. So far, the office group has successively introduced many specifications such as 802.11a/b/g/i/e/n/k, which are improving day by day in terms of user bandwidth, wireless security, and manageability. Based on the latest 802.11n specification, the WLAN physical bandwidth can theoretically reach 900Mbps. At that time, the bandwidth of mainstream 802.11n products was up to 300M per frequency, and APs supporting 802.11n had become the first choice for WLAN construction.)
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