Talking about WiFi wireless networking technology
Speaking of WiFi, everyone knows that you can surf the Internet. However, for WiFi itself, is it clear to everyone? In fact, WiFi is a wireless connection, not a wireless network or other wireless devices. To distinguish WiFi wireless networking technology from other concepts, this is the starting point of this article. Through this article, I hope everyone can recognize it. Wi-Fi is a technology that can wirelessly connect terminals such as personal computers and handheld devices (such as PDAs and mobile phones). Wi-Fi is a brand of wireless network communication technology and is owned by the Wi-Fi Alliance. The goal is to improve interoperability between wireless network products based on the IEEE 802.11 standard. At present, people generally confuse Wi-Fi with IEEE 802.11. Even equating Wi-Fi with the wireless internet. The Wi-Fi Alliance was founded in 1999 as the Wireless Ethernet CompaTIbility Alliance (WECA). In October 2002, it was officially renamed the Wi-Fi Alliance. Popular saying: WiFi is a wireless networking technology. Previously, it was connected to a computer through a network cable. Now it is connected by radio waves. The common one is a wireless router. The effective range of radio coverage in this wireless router can be used. The WiFi connection method is used for networking. If the wireless router is connected to an ADSL line or another Internet line, it is also called a "hot spot". Nowadays, the common wireless routers on the market are mostly 54M speed, and the previous level is 108M speed. Of course, this speed is not the speed of your Internet. The speed of the Internet is mainly determined by the WiFi hotspot Internet line. The first version of IEEE 802.11 was published in 1997, which defines the medium access control layer (MAC layer) and the physical layer. The physical layer defines two wireless frequency modulation methods and one infrared transmission method working in the 2.4 GHz ISM band, and the total data transmission rate is designed to be 2 Mbit/s. The communication between the two devices can be performed in an ad hoc manner, or in coordination with a base station (Base StaTIon, BS) or an access point (AP). Two additional versions were added in 1999: 802.11a defines a physical layer with a data rate of 54 Mbit/s on the 5 GHz ISM band, and 802.11b defines a 2.4 GHz ISM band with a high data transfer rate. 11Mbit/s physical layer. The 2.4 GHz ISM band is common to most countries in the world, so 802.11b is the most widely used. Apple named the 802.11 standard it developed as AirPort. In 1999, the industry established the Wi-Fi Alliance to address the production and device compatibility issues of products that comply with the 802.11 standard. Wi-Fi is an organization that develops 802.11 wireless networks and does not represent wireless networks. A new generation of wireless networks will create a new feel for wireless LANs without the need for wiring and relative freedom. Demand determines the development of the market. It is rare to see which kind of IT technology or product can have such rapid growth momentum as it does. It is no longer a dream to access the Internet anytime and anywhere without any constraints. Among them, WiFi plays a vital role. The role. Wi-Fi stands for "Wireless Fidelity", which refers to the fully compatible 802.11 standard IEEE 802.11b subset, which uses an open 2.4 GHz direct sequence spread spectrum with a maximum data rate of 11 Mbps, depending on the strength of the signal. The transmission rate is adjusted to 5.5Mbps, 2Mbps and 1Mbps bandwidth. It does not require a straight-line transmission transmission range of up to 300 meters in the outdoor and 100 meters in the case of indoor obstacles. It is the most widely used transmission protocol. WiFi wireless networking technology networks have many advantages over wired networks: No wiring required The main advantage of WiFi is that it does not require wiring and can be free from the restrictions of wiring conditions, so it is very suitable for the needs of mobile office users and has broad market prospects. At present, it has expanded from traditional industries such as healthcare, inventory control and management services to more industries, and even entered the family and educational institutions. health and safety The transmission power specified by IEEE802.11 cannot exceed 100 mW, and the actual transmit power is about 60~70 mW. What kind of concept is this? The mobile phone's transmit power is about 200 milliwatts to 1 watt, and the handheld walkie-talkie is up to 5 watts, and the wireless network is not used directly like a mobile phone, it is absolutely safe. Stylus Pen For Microsoft Surface Product catagories of Stylus Pen For Microsoft Surface, which just can be worked on below Surface model, Please confirm your surface model before buying.
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