82.11 2.4ghz 2mbps
82.11a 54ghz 54mbps
82.11b 2.4ghz 11mbps
82.11g 2.4ghz. 54Mbps
82.11n 2.4 or 5GHz 54Mbps
82.11 protocol has been gradually eliminated with the development and popularization of extended protocols, and there are few notebook computers supporting 82.11 protocol in the market. 82.11b is a wireless network protocol formed after 82.11 protocol, which is popular for a while, but it only has 11Mbps bandwidth, which can't meet the special business requirements in many LANs. Then, 82.11a appeared. This protocol can support up to 54Mbps, which can meet the needs of most services. However, it works at 5GHz and is not compatible with 82.11 and 82.11b in hardware, so it is difficult to seize the existing customer base of 82.11b and has not been popularized. In order to maintain the high-speed rate of 82.11a and the compatibility of 82.11b, the 82.11g protocol is optimized on the basis of 82.11b, which not only maintains the speed of 54Mbps, but also is compatible with the working frequency band of 82.11b 2.4GHz, and has good hardware compatibility for the 82.11b customer base, and has become the mainstream. After the 82.11g protocol, people have improved the wireless network speed and better frequency band compatibility protocol-82.11n, because it belongs to the wireless network protocol that was born not long ago and has not been supported by most wireless network devices, so it is rarely seen in the market.
from the development history of 82.11 wireless network protocol, it is not difficult to see that if you choose a wireless notebook computer supporting 82.11b/g, it will have better compatibility in use and maintain a high wireless bandwidth of 54Mbps; Notebooks supporting 82.11a and 82.11n wireless Internet access alone are rare in China, so it is not recommended to buy them. Of course, with the passage of time, maybe 82.11n will become the mainstream wireless network protocol, and then you can buy a notebook computer that supports 82.11n wireless network card.
it should be added that the wireless network of notebook computers can be divided into wireless local area network and wireless wide area network communication. Wireless local area network only refers to wireless communication between multiple computers, while wireless wide area network supports one or more computers to access the Internet, but wireless local area network is usually a part of wireless wide area network communication. The protocol introduced in this article is mainly aimed at wireless LAN. A notebook computer with the "WIFI" logo must be a product that conforms to the 82.11 protocol family.