Both home and business users have many options for finding wireless local area network (WLAN) solutions. Many products support Wi-Fi technology standards such as 802.11a, 802.11b, 802.11g, and 802.11n. In addition, there are Bluetooth and various other non-Wi-Fi technologies, all of which have their own specific network standards.
This article will introduce you to the comparison of Wi-Fi and its related technologies to help readers choose the right wireless network application.
802.11 standard
In 1997, the Institute of Electrical and Electronics Engineers (IEEE) developed the first wireless LAN standard 802.11, which is mainly used to solve the wireless access of users and user terminals in office LANs and campus networks. The service is mainly limited to data access. Can reach 2Mbps. Because it can't meet people's needs in terms of speed and transmission distance, 802.11 wireless products are no longer produced.
802.11n
This standard is the latest standard introduced by IEEE. By adopting smart antenna technology, 802.11n can provide WLAN transmission rate from 54Mbps and 108Mbps provided by 802.11a and 802.11g to 300Mbps or even 600Mbps. Thanks to the MIMO OFDM technology that combines MIMO (Multiple Input Multiple Output) with OFDM (Orthogonal Frequency Division Multiplexing) technology, the wireless transmission quality is improved, and the transmission rate is greatly improved.
In addition, 802.11n uses a software radio technology, which is a fully programmable hardware platform, enabling base stations and terminals of different systems to be interoperable and compatible through different software of this platform, which makes WLAN compatibility available. Greatly improved. This means that WLAN will not only achieve 802.11n forward and backward compatibility, but also enable the combination of WLAN and wireless wide area network, such as 3G.
802.11n advantages - with the fastest network speed and the widest signal coverage; signal interference has less impact.
802.11n shortcomings - standards are not formally determined; cost is high; using multiple signals can easily interfere with the attached 802.11b/g network.
802.11g
Between 2002 and 2003, WLAN products began to have a new standard 802.11g. 802.11g combines the advantages of both 802.11a and 802.11b and is a hybrid standard. It can adapt to the traditional 802.11b standard, providing 11Mbit/s data transmission rate per second at 2.4GHz, and 56Mbit/s data transmission rate at 5GHz with 802.11a standard.
802.11g advantages - higher network speed; good signal quality, not easy to be blocked.
The disadvantage of 802.11g - the cost is higher than 802.11b; electrical equipment may affect the 2.4GHz band signal.
802.11b
In July 1999, IEEE expanded the 802.11 application standard and created the 802.11b standard. The standard can support data transfer rates of up to 11 Mbps compared to traditional Ethernet. 802.11b inherits the 802.11 wireless signal frequency standard and uses 2.4 GHz direct sequence spread spectrum. Vendors are also more willing to adopt this frequency standard because it can reduce product costs. On the other hand, wireless LAN signals are also easily interfered with by signals from microwave ovens, cordless phones, or other electrical devices due to the use of unregulated 2.4 GHz spread spectrum. Of course, solving this problem is also very simple. When installing 802.11b devices, be careful to keep a certain distance from other devices.
Advantages of 802.11b - low cost; good signal radiation, not easy to be blocked.
Disadvantages of 802.11b - low bandwidth rate; signals are susceptible to interference.
802.11a
While 802.11b is still evolving, the IEEE has created another WLAN standard, 802.11a. Since 802.11b is more popular than 802.11a, some people think that 802.11a was created after 802.11b. In fact, 802.11a and 802.11b were created almost at the same time. Due to the high cost of 802.11a, it is mainly used in the commercial field, while 802.11b is mainly used in the home market.
802.11a offers a maximum data rate of 54 Mbps and operates in the 5 GHz band. This higher frequency means that 802.11a signals are more susceptible to walls or other obstacles.
In addition, since 802.11a and 802.11b use different frequency standards, the two are mutually incompatible. To this end, some vendors offer 802.11a/b network modules in their computers to cope with wireless networking needs in different environments.
802.11a advantages - have a higher network speed; signals are not easily interfered.
802.11a disadvantages - higher cost; signals are easily blocked by obstacles.
Bluetooth and other
In addition to the four common Wi-Fi standards described above, there are other wireless networking technologies.
Other IEEE 802.11 working group standards such as 802.11h and 802.11j also exist as an extension branch of Wi-Fi technology.
Bluetooth is an alternative wireless networking technology that complements the 802.11 family. Bluetooth can achieve network transmission (1~3Mbps rate) on low-power network devices within a short distance (about 10 meters), such as handheld computers, Bluetooth mobile phones, and so on. The low cost of Bluetooth manufacturing has made Bluetooth soon to be industrialized. Today, you can see PDAs and smartphones with Bluetooth technology anytime, anywhere. However, Bluetooth is rarely used on WLAN networks because of the disadvantages of Bluetooth application range and transmission rate.
WiMax (aka 802.16) is an emerging broadband wireless access technology that provides high-speed connectivity to the Internet with data transmission distances up to 50km. WiMAX is also a technical system for the future public wireless broadband data network proposed by the Internet camp. It represents the broadband and intelligent features of future wireless communication systems, such as flat protocol structure and network structure, support for high-speed data transmission and seamless roaming, and support. Various types of services guarantee their QoS at the MAC layer and the physical layer.
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