What is WiFi (Wi-Fi)? The IEEE 802.11b wireless network specification is a variant of the IEEE 802.11 network specification. The maximum bandwidth is 11 Mbps. With weak or disturbed signals, the bandwidth can be adjusted to 5.5 Mbps, 2 Mbps, and 1 Mbps. The automatic adjustment of bandwidth effectively protects the stability and reliability of the network. Its main features are: high speed, high reliability, in the open area, communication distance up to 305 meters, in the closed area, the communication distance is 76 meters to 122 meters, convenient integration with the existing wired Ethernet, networking The cost is lower.
Wi-Fi  WirelessFidelity, wireless fidelity technology and Bluetooth technology, belong to the short-range wireless technology used in the office and home. The technology uses a frequency band around 2.4 GHz, which is currently a wireless band that is not licensed. There are two standards that can be used at present, namely IEEE802.11a and IEEE802.11b. This technology is favored by manufacturers because of its own advantages.
The outstanding advantages of Wi-Fi technology are:
First, radio waves cover a wide range. The coverage of radio waves based on Bluetooth technology is very small. The radius is only about 50 feet or about 15 meters. The Wi-Fi radius is about 300 feet. It is about 100 meters. Hey, the office needs to say it, but it is also available in the entire building. Recently, a new switch was introduced by Vivato. It is reported that this product can expand the communication distance of current Wi-Fi wireless network 300 feet, nearly 100 meters, to 4 miles, approximately 6.5 kilometers. Second, although the quality of wireless communication transmitted by Wi-Fi technology is not good, data The security performance is worse than that of Bluetooth, and the transmission quality needs to be improved. However, the transmission speed is very fast and can reach 11 mbps, which is in line with the needs of personal and social information.
Third, the threshold for manufacturers to enter the field is relatively low. Manufacturers only need to set up “hot spots†at places where airports, stations, coffee shops, and libraries are densely populated, and access the Internet through high-speed lines. In this way, since the radio wave emitted by the “hot spot†can reach a distance of tens of meters to 100 meters from the access point, the user can access the Internet at a high speed by simply taking a wireless LAN-capable laptop or PDA into the area. . In other words, manufacturers do not need to spend money for network cabling access, which saves a lot of costs.
According to the different standards used by wireless network cards, the speed of WIFI is also different. Among them, the highest IEEE 802.11b is 11 Mbps (some manufacturers can achieve 22 Mbps in the case of equipment support), IEEE 802.11a is 54 Mbps, and IEEE 802.11g is also 54 Mbps.
WIFI is a wireless network composed of AP (Access Point) and wireless network card. APs are generally called network bridges or access points. They are used as a bridge between traditional wired LANs and wireless local area networks. Therefore, any PC with a wireless network card can share the wired LAN through the AP. Even the resources of the wide area network, its working principle is equivalent to a built-in wireless transmitter HUB or routing, and the wireless network card is responsible for receiving the signal transmitted by the CLIENT CLIENT equipment.
The wireless b/g indicates the model of the network card. According to its speed and technology, it can be divided into 802.11a, 802.11b, and 802.11g.
Speaking of wireless networks, everyone has a plausible feeling. Does wireless simply interconnect two computers? No! This is already the concept of wireless in the last century. A new generation of wireless networks will create new experiences for wireless LANs without the need for wiring and use. Demand determines the development of the market. It is rare to see which kind of IT technology or products can grow like this with such rapid momentum. It is no longer a dream to access the Internet anytime and anywhere without any constraints. Among them, WiFi has played a crucial role. The role. Wi-Fi stands for "wireless fidelity" and refers to the fully compatible 802.11 standard IEEE802.11b subset. It uses open 2.4 GHz direct-sequence spread spectrum, with a maximum data transmission rate of 11 Mbps, and can also be based on signal strength. The transmission rate is adjusted to 5.5Mbps, 2Mbps, and 1Mbps bandwidth. No linear transmission is required. The maximum transmission range is 300 meters outdoors, and 100 meters maximum when there are obstacles in the room. It is the most widely used transmission protocol. Compared with wired networks, it has many advantages:
The main advantage of WiFi without wiring is that it does not require wiring, and it is not limited by the wiring conditions. Therefore, it is very suitable for the needs of mobile office users and has a broad market prospect. At present, it has expanded from more traditional industries such as healthcare, inventory control and management services to more industries, and has even begun to enter homes and educational institutions.
The emission power stipulated by the health and safety IEEE802.11 must not exceed 100 milliwatts, and the actual transmit power is about 60 to 70 milliwatts. What kind of concept is this? The transmission power of the mobile phone is about 200 milliwatts to 1 watt, and the handheld radio is up to 5 watts. The way of using the wireless network is not like direct contact with the human body. It should be absolutely safe.
Simple setup method The basic equipment for setting up a wireless network is a wireless network adapter and an AP. This way, wireless resources can be shared with existing wired architectures. The cost of setup and complex procedures are much lower than traditional wired networks. The internet. If it is only a peer-to-peer network of a few computers, you may not need an AP. You only need a wireless network card for each computer. The AP is an abbreviation for Access Point, which is generally translated as "wireless access node" or "bridge." It acts as a bridge between wireless workstations and wired local area networks in the media access control layer MAC. With an AP, just like a typical wired network Hub, wireless workstations can quickly and easily connect to the network. Especially for the use of broadband, WiFi has even more advantages. After the wired broadband network (ADSL, residential LAN, etc.) arrives at the home, it is connected to an AP, and then a wireless network card can be installed in the computer. Ordinary households have enough APs. Even after the user's neighbors are authorized, they do not need to add ports. They can also access the Internet in a shared manner.
Long-distance work Do not look at wireless WIFI's working distance is not big, in the case of complete network construction, 802.11b's real working distance can reach more than 100 meters, and to solve the high-speed data error correction problem, error code, WIFI Switching and security authentication between equipment and equipment, equipment and base stations have all been well resolved.
With the development of WiFi and the next two years, the number of wireless APs has grown rapidly, and the convenience and efficiency of wireless networks have made it possible to gain rapid popularity. In addition to APs in some of the current public places, there are precedents in foreign countries to build metropolitan area networks using wireless standards. Therefore, WiFi's wireless status will become increasingly solid.
WiFi is the current mainstream standard for wireless access, but how far will WiFi go? With the strong support of Intel, WiFi already has successors. It is a WiMAX that is fully compatible with existing WiFi. Compared with WiFi's 802.11X standard, WiMAX is 802.16x. Compared with the former, WiMAX has more distant transmission distances, wider frequency band choices, and higher access speeds. It is expected to become a mainstream standard for wireless networks in the coming years. Intel plans to adopt this standard in the future. Wireless wide area network. This is a qualitative change compared to the current wireless LAN or metropolitan area network, and existing equipment can still be supported to protect people's every penny investment.
All in all, the demand for mobile connectivity between home and small office network users is the driving force for the growth of the wireless LAN market. Although developed countries such as the United States and Japan are still the regions with the largest number of WiFi users, with e-commerce and mobile offices. Further popularization, cheap WiFi, will certainly become the inevitable choice for those who need to make network connections at any time.
Wi-Fi  WirelessFidelity, wireless fidelity technology and Bluetooth technology, belong to the short-range wireless technology used in the office and home. The technology uses a frequency band around 2.4 GHz, which is currently a wireless band that is not licensed. There are two standards that can be used at present, namely IEEE802.11a and IEEE802.11b. This technology is favored by manufacturers because of its own advantages.
The outstanding advantages of Wi-Fi technology are:
First, radio waves cover a wide range. The coverage of radio waves based on Bluetooth technology is very small. The radius is only about 50 feet or about 15 meters. The Wi-Fi radius is about 300 feet. It is about 100 meters. Hey, the office needs to say it, but it is also available in the entire building. Recently, a new switch was introduced by Vivato. It is reported that this product can expand the communication distance of current Wi-Fi wireless network 300 feet, nearly 100 meters, to 4 miles, approximately 6.5 kilometers. Second, although the quality of wireless communication transmitted by Wi-Fi technology is not good, data The security performance is worse than that of Bluetooth, and the transmission quality needs to be improved. However, the transmission speed is very fast and can reach 11 mbps, which is in line with the needs of personal and social information.
Third, the threshold for manufacturers to enter the field is relatively low. Manufacturers only need to set up “hot spots†at places where airports, stations, coffee shops, and libraries are densely populated, and access the Internet through high-speed lines. In this way, since the radio wave emitted by the “hot spot†can reach a distance of tens of meters to 100 meters from the access point, the user can access the Internet at a high speed by simply taking a wireless LAN-capable laptop or PDA into the area. . In other words, manufacturers do not need to spend money for network cabling access, which saves a lot of costs.
According to the different standards used by wireless network cards, the speed of WIFI is also different. Among them, the highest IEEE 802.11b is 11 Mbps (some manufacturers can achieve 22 Mbps in the case of equipment support), IEEE 802.11a is 54 Mbps, and IEEE 802.11g is also 54 Mbps.
WIFI is a wireless network composed of AP (Access Point) and wireless network card. APs are generally called network bridges or access points. They are used as a bridge between traditional wired LANs and wireless local area networks. Therefore, any PC with a wireless network card can share the wired LAN through the AP. Even the resources of the wide area network, its working principle is equivalent to a built-in wireless transmitter HUB or routing, and the wireless network card is responsible for receiving the signal transmitted by the CLIENT CLIENT equipment.
The wireless b/g indicates the model of the network card. According to its speed and technology, it can be divided into 802.11a, 802.11b, and 802.11g.
Speaking of wireless networks, everyone has a plausible feeling. Does wireless simply interconnect two computers? No! This is already the concept of wireless in the last century. A new generation of wireless networks will create new experiences for wireless LANs without the need for wiring and use. Demand determines the development of the market. It is rare to see which kind of IT technology or products can grow like this with such rapid momentum. It is no longer a dream to access the Internet anytime and anywhere without any constraints. Among them, WiFi has played a crucial role. The role. Wi-Fi stands for "wireless fidelity" and refers to the fully compatible 802.11 standard IEEE802.11b subset. It uses open 2.4 GHz direct-sequence spread spectrum, with a maximum data transmission rate of 11 Mbps, and can also be based on signal strength. The transmission rate is adjusted to 5.5Mbps, 2Mbps, and 1Mbps bandwidth. No linear transmission is required. The maximum transmission range is 300 meters outdoors, and 100 meters maximum when there are obstacles in the room. It is the most widely used transmission protocol. Compared with wired networks, it has many advantages:
The main advantage of WiFi without wiring is that it does not require wiring, and it is not limited by the wiring conditions. Therefore, it is very suitable for the needs of mobile office users and has a broad market prospect. At present, it has expanded from more traditional industries such as healthcare, inventory control and management services to more industries, and has even begun to enter homes and educational institutions.
The emission power stipulated by the health and safety IEEE802.11 must not exceed 100 milliwatts, and the actual transmit power is about 60 to 70 milliwatts. What kind of concept is this? The transmission power of the mobile phone is about 200 milliwatts to 1 watt, and the handheld radio is up to 5 watts. The way of using the wireless network is not like direct contact with the human body. It should be absolutely safe.
Simple setup method The basic equipment for setting up a wireless network is a wireless network adapter and an AP. This way, wireless resources can be shared with existing wired architectures. The cost of setup and complex procedures are much lower than traditional wired networks. The internet. If it is only a peer-to-peer network of a few computers, you may not need an AP. You only need a wireless network card for each computer. The AP is an abbreviation for Access Point, which is generally translated as "wireless access node" or "bridge." It acts as a bridge between wireless workstations and wired local area networks in the media access control layer MAC. With an AP, just like a typical wired network Hub, wireless workstations can quickly and easily connect to the network. Especially for the use of broadband, WiFi has even more advantages. After the wired broadband network (ADSL, residential LAN, etc.) arrives at the home, it is connected to an AP, and then a wireless network card can be installed in the computer. Ordinary households have enough APs. Even after the user's neighbors are authorized, they do not need to add ports. They can also access the Internet in a shared manner.
Long-distance work Do not look at wireless WIFI's working distance is not big, in the case of complete network construction, 802.11b's real working distance can reach more than 100 meters, and to solve the high-speed data error correction problem, error code, WIFI Switching and security authentication between equipment and equipment, equipment and base stations have all been well resolved.
With the development of WiFi and the next two years, the number of wireless APs has grown rapidly, and the convenience and efficiency of wireless networks have made it possible to gain rapid popularity. In addition to APs in some of the current public places, there are precedents in foreign countries to build metropolitan area networks using wireless standards. Therefore, WiFi's wireless status will become increasingly solid.
WiFi is the current mainstream standard for wireless access, but how far will WiFi go? With the strong support of Intel, WiFi already has successors. It is a WiMAX that is fully compatible with existing WiFi. Compared with WiFi's 802.11X standard, WiMAX is 802.16x. Compared with the former, WiMAX has more distant transmission distances, wider frequency band choices, and higher access speeds. It is expected to become a mainstream standard for wireless networks in the coming years. Intel plans to adopt this standard in the future. Wireless wide area network. This is a qualitative change compared to the current wireless LAN or metropolitan area network, and existing equipment can still be supported to protect people's every penny investment.
All in all, the demand for mobile connectivity between home and small office network users is the driving force for the growth of the wireless LAN market. Although developed countries such as the United States and Japan are still the regions with the largest number of WiFi users, with e-commerce and mobile offices. Further popularization, cheap WiFi, will certainly become the inevitable choice for those who need to make network connections at any time.
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