无线网卡（Wireless network adapter）.doc

无线网卡（Wireless network adapter） Wireless card, edge wireless card catalog Wireless network card definition Wireless card standard Wireless card usage Development of wireless network card [edit this paragraph] definition of wireless network card The so-called wireless network, wireless LAN is the use of radio waves as an information transmission medium consisting of (WLAN), is very similar with the wired network, the biggest difference lies in the different transmission media, using radio technology can replace cable and cable network, mutual backup, but the speed is too slow. The wireless network card is the terminal wireless network equipment, is the wireless LAN wireless coverage, through the wireless connection network carries on the Internet to use the wireless terminal equipment. The wireless network card is to make your computer can be a wireless device to the Internet use, but there is also need a wireless network card can be connected to the wireless network, if you are at home or the location of a wireless router or wireless AP (AccessPoint wireless access point) coverage, you can through the wireless network card to the wireless connection can access wireless network. [edit this paragraph] wireless network card standard 1.IEEE 802.11a: using the 5GHz band, the transmission speed of 54Mbps, and 802.11b incompatible; 2.IEEE 802.11b: use 2.4GHz frequency band, transmission speed 11Mbps; 3.IEEE 802.11g: using the 2.4GHz band, the transmission speed of 54Mbps, can be compatible with 802.11b downward; 4.IEEE 802.11n (Draft 2): Intel for the new Centrino 2 notebook and high-end routing, can be compatible, transmission speed of 300Mbps. [edit this paragraph] wireless network card usage Wi Fi has no connection to the wireless network, and there must be wireless AP, which is equivalent to a hub for a wired network. The wireless network can only be connected only if the wireless AP can be covered in proper settings. Wireless Internet is by wireless network card, of co