The wireless network card is actually a terminal wireless network device, which needs to be connected to the Internet through a wireless connection network under the wireless coverage of the wireless local area network. In other words, a wireless network card is a device that allows your computer to use wireless to access the Internet, but with a wireless network card, you also need a wireless network that can be connected to, so you need to use it with a wireless router or wireless AP to pass the wireless network card Connect to the wireless network wirelessly to get online.
The function and function of the wireless network card are the same as the ordinary computer network card, which is used to connect to the local area network. It is just a device for sending and receiving signals. It can only connect to the Internet when it finds an outlet on the Internet. All wireless network cards can only be limited to the range where the wireless LAN has been deployed. A wireless network card is a network card that uses wireless signals to connect without a wired connection.
Wireless network cards can be distinguished according to different interface types. The first is the USB wireless network card, which is the most common at present; the second is the PCI interface wireless network card dedicated for desktop computers; the third is the PCMCIA interface wireless dedicated for notebook computers. Network card; The fourth is the MINI-PCI wireless network card built into the laptop.
As mentioned above, we simply cannot connect to a wireless network with a wireless network card, and we must also have a wireless router or wireless AP. A wireless network card is like a receiver, and a wireless router is equivalent to a transmitter. In fact, you still need a wired Internet line to connect to the wireless cat, and then convert the signal into a wireless signal and transmit it to be received by the wireless network card. The general wireless router can drag 2-4 wireless network cards, the working distance is within 50 meters, the effect is better, and the communication quality is very poor.
At present, the mainstream standard of wireless network cards is IEEE802.11n, which greatly enhances the competitiveness of wireless local area networks. The standards and technologies of wireless local area networks have developed rapidly. The products have gradually matured and the applications of wireless local area networks have become increasingly abundant. More and more home users are beginning to use wireless networks, and many companies are also setting up wireless LANs in their office buildings. At the same time, telecom operators have paid great attention to wireless LANs. Now whether in airports, hotels, or coffee Public wireless networks are laid in public areas such as halls to provide convenient wireless Internet access for everyone.
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The origin of wireless network card
When it comes to the historical origins of wireless network cards, one cannot but mention the history of wireless local area networks. The origin of the wireless local area network can be traced back to the 1940s during the Second World War, when the US Army used radio signals for data transmission, they developed a set of radio transmission technology, and used a very high encryption. Later, this technology was widely used among the US and Allied forces; this caused some scholars to be interested in this and get inspiration from it.
In 1971, researchers at the University of Hawaii created the first radio communication network based on packet technology, called the ALOHNET network, which was the earliest wireless local area network (WLAN). This WLAN includes 7 computers, using a bi-directional star topology (bi-directional startopology) across four Hawaiian islands, and the central computer is placed on Oahu Island (Oahu Island). From this point on, wireless LAN can be said to be officially born.
Although we cannot find only a few words about the wireless network card from the limited information, we can be sure that the ancestor of today's wireless network card must have appeared. If the world's first wireless network experiment started successfully in 1971, then the history of wireless network cards has been just 35 years.
In fact, the large-scale development of wireless LAN was in the 1990s.
In 1997, IEEE (The Institute of Electricaland Electronics Engineers) proposed and formulated the earliest wireless standard IEEE802.11; in September 1999, it also proposed the IEEE802.11a standard and the IEEE802.11b standard.
With the introduction of the IEEE802.11a and IEEE802.11b standards and the establishment of the Wi-Fi organization, the compatibility, standardization, and marketization of wireless LAN products have been promoted. Since then, wireless LANs have received more and more attention with the popularity of computers.
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