WiFi basics WIFI related brief introduction The full name is Wireless Fidelity, also known as the 802.11b standard. Its biggest advantage is its high transmission speed, which can reach 11Mbps. In addition, its effective distance is also long, and it is also compatible with various existing 802.11DSSS devices. The most popular notebook computer technology this summer, Centrino technology, is based on this standard. The IEEE (Institute of Electronics and Electrical Engineers [US]) 802.11b wireless network specification is a variant of the IEEE802.11 network specification. The maximum bandwidth is 11Mbps. In the case of weak signals or interference, the bandwidth can be adjusted to 5.5Mbps, 2Mbps and 1Mbps. The automatic adjustment of bandwidth effectively guarantees the stability and reliability of the network. Its main features are: fast speed, high reliability, in open areas, the communication distance can reach 305 meters, in closed areas, the communication distance is 76 meters to 122 meters, which is convenient for integration with existing wired Ethernet networks, and the cost of networking is lower. Wi-Fi (Wireless Fidelity) technology, like Bluetooth technology, is a short-range wireless technology used in offices and homes. This technology uses a frequency band near 2.4GHz, which is currently an unlicensed wireless frequency band. There are two standards currently available, namely IEEE802.11a and IEEE802.11b. This technology is favored by manufacturers because of its own advantages. One of the outstanding advantages of WIFI is that the radio wave has a wide coverage range. The radio wave coverage range based on Bluetooth technology is very small, with a radius of only about 50 feet (about 15 meters), while the radius of Wi-Fi can reach about 300 feet (about 100 meters), not to mention the office, it can also be used in the entire building. Recently, a new switch was launched by Vivato. It is reported that this product can expand the current communication distance of 300 feet (nearly 100 meters) of Wi-Fi wireless network to 4 miles (about 6.5 kilometers). Secondly, although the quality of wireless communication transmitted by Wi-Fi technology is not very good, the data security performance is worse than Bluetooth, and the transmission quality needs to be improved, the transmission speed is very fast, which can reach 11mbps, meeting the needs of personal and social informatization. …
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