Introduction of WLAN:
WLAN full name: Wireless Local Area Networks, the Chinese interpretation of the: wireless local area network, is a use of radio frequency (Radio Frequency RF) technology for the transmission of data system, the emergence of this technology is by no means used to replace the wired local area network, but to make up for the shortcomings of the wired local area network to achieve the purpose of network extension, so that the wireless local area network can use simple access architecture to allow users to realize no access through it to the network. The emergence of this technology is by no means a replacement for wired LANs, but is used to make up for the shortcomings of wired LANs to achieve the purpose of network extension, enabling wireless LANs to utilize a simple access architecture to allow users to pass through it and realize a smooth network without wires or distance restrictions.
WLAN communication systems are generally used in the same building as an alternative to wired LANs, and WLANs use the ISM (Industrial, Scientific, Medical) radio broadcast band to communicate. 802.11a standard for WLANs uses the 5 GHz band and supports a maximum speed of 54 Mbps, while 802.11b and 802.11a standards use the 5 GHz band and support maximum speeds of 54 Mbps, while 802.11b and 802.11a standards use the 5 GHz band and support maximum speeds of 54 Mbps. The 802.11a standard for WLANs uses the 5 GHz band and supports a maximum speed of 54 Mbps, while the 802.11b and 802.11g standards use the 2.4 GHz band and support speeds of up to 11 Mbps and 54 Mbps respectively. No license is required to work in the 2.4 GHz band, which is a dedicated band for industry, education, and healthcare and is publicly available, and a license is required to work in the 5.15-8.825 GHz band.
Currently, the protocol standards included in WLAN are: IEEE802.11b protocol, IEEE802.11a protocol, IEEE802.11g protocol, IEEE802.11E protocol, IEEE802.11i protocol, and Wireless Application Protocol (WAP).
Introduction of WIFI:
WIFI (WirelessFidelity) technology is a brand of wireless network communication technology based on the IEEE 802.11 series of standards, with the aim of improving the interoperability between wireless network products based on the IEEE 802.11 standard, held by the Wi-Fi Alliance (Wi-Fi). Alliance) held by the Wi-Fi Alliance (Wi-Fi Alliance), simply put WIFI is a wireless networking technology, previously connected to the computer through the network, but now it is through the radio waves to connect to the network. The Wi-Fi Alliance (also known as: Wireless LAN Standardization Organization WECA) was founded in 1999 as the Wireless Ethernet Compatibility Alliance (WECA), and was officially renamed the Wi-Fi Alliance in October 2002.
With Bluetooth, WIFI is a technology that can be used in offices and homes. Wi-Fi is a short-range wireless technology used in offices and homes. The technology uses the frequency band around 2.4GHz, which is currently an unlicensed wireless band. There are two standards available, IEEE802.11a and IEEE802.11b. The bandwidth can be adjusted to 5.5Mbps, 2Mbps and 1Mbps in case of weak signals or interference, and the automatic adjustment of the bandwidth effectively guarantees the stability and reliability of the network. This technology is favored by vendors because it has its own advantages.
Difference between WLAN and WIFI:
In fact, WIFI is a trademark of WLANA (Wireless LAN Alliance), which only guarantees that commodities using the trademark can cooperate with each other, and has no relationship with the standard itself, but because WIFI mainly adopts the 802.11b protocol, people are gradually accustomed to use WIFI to refer to the 802.11b protocol. 802.11b protocol. In terms of inclusion, WIFI is a standard for WLANs, and WIFI is included in WLANs, which is a new technology that adopts the WLAN protocol.
WiFi has a coverage range of up to about 300 feet (about 90 meters), while WLAN has a maximum (with antenna) of 5KM.
Difference between WIFI and WLAN Introduction
WIFI: Wireless Fidelity, also known as the 802.11b standard, which has the greatest advantage of a higher transmission speed of up to 11Mbps, plus the ability to transmit at a higher speed. It can reach up to 11Mbps, plus it has a long effective range and is also compatible with a variety of existing 802.11DSSS devices. This summer's most popular notebook - Centrino technology is based on this standard, wireless Internet access has become a reality. Radio waves cover a wide area. Bluetooth-based technology covers a very small area, with a radius of about 50 feet or about 15 meters, while Wi-Fi has a radius of about 300 feet or about 100 meters, and can be used in the office, needless to say, or in an entire building. Recently, a new switch was introduced by Vivato. It is said to be able to extend the current Wi-Fi wireless network 300 feet close to 100 meters of communication distance to 4 miles about 6.5 kilometers.
1. What is a WLAN?
Answer: WLAN stands for Wireless Local Area Network, and refers to the application of wireless communication technology to interconnect computer devices to form a network system that can communicate with each other and realize resource **** enjoyment. Wireless LAN is essentially characterized by no longer using communication cables to connect computers to the network, but through the wireless way to connect, thus making the construction of the network and terminal movement more flexible.
2. How fast can a WLAN be?
A: China Mobile WLAN adopts the 802.11b standard, which can provide a rate of 11Mbps, which is 200 times higher than that of fixed dial-up (56K), and allows you to browse the WWW, send and receive EMAILs, enjoy movies on the Internet, download files, and conduct office work.
3. How do I understand the uniqueness restriction of WLAN?
A: During the trial commercial period, there is no restriction on uniqueness, i.e., the same account number and password allow multiple people to access the Internet at the same time. Therefore, users can enjoy the same account and password with their relatives and friends, but at the same time, they should pay attention to the password to prevent it from being stolen by others.
4. What are the similarities and differences between WLAN and GPRS?
WLAN and GPRS are both wireless Internet access methods provided by China Mobile, and they ****together make up China Mobile's "With e-Hanging" service, which provides users with the wireless Internet access experience of "Networking with you, the world with you".
China Mobile currently provides GPRS network coverage in more than 240 cities, indoors, outdoors, stationary or high-speed movement, can be realized through GPRS wireless Internet access, Internet access rate is generally 20-30Kb; China Mobile in the country's 31 provinces, capital cities, municipalities, and economically developed and key cities, such as airports, high-level hotels, conference centers, exhibition halls, and other hot spots WLAN China Mobile has WLAN network coverage in 31 provincial capital cities, municipalities directly under the central government, and economically developed and key cities, including airports, high-level hotels, conference centers, exhibition halls, and other hotspots, with more than 800 locations, and will continue to expand. These networks are generally indoors, and the WLAN Internet access rate is 11M, which is much higher than GPRS, but there are limitations on coverage.
By providing users with both WLAN services and GPRS services, China Mobile gives users the right choice in different environments.
5. What terminal equipment is required to use WLAN?
Answer: Generally speaking, users need to have a laptop/PDA and a wireless Internet card; if there is a built-in WLAN card in the laptop, then there is no need to configure an additional card. If the user chooses to use SIM authentication, a SIM card is also required.
6. Is it possible to change the tariff of SMS application service, which is a free package?
A: Yes. According to the modification practice of each province.
7. Is there any special regulation on the password when using the authentication method of "cell phone number + password"?
A: The length of the password must be 6 digits, consisting of 0-9 Arabic numerals and 26 English letters, and the password is case sensitive.
8. What are the specific requirements for users to use CMCC wlan service?
A: Generally speaking, users need to have a laptop/PDA and a wireless Internet card. When users choose to use the SIM method of authentication, they also need to have a SIM card.
9. Can I use WLAN service now?
A: During the trial commercialization period, only selected trial commercial users can apply for services from China Mobile, but some owners in hot spots can also provide WLAN services to their users.
10: Can I use WLAN service if I have a wireless Internet card and a laptop?
A: Users need to apply for the service first, and can use it only after the correct configuration of the network card.