Classification of wireless network cards

Before introducing wireless network interfaces, I would like to summarize some of the currently popular Wireless Access Technologies in China and internationally (technical details are not described ), because different wireless access technologies must adopt different wireless network interfaces, although some of them are not market-oriented. Including GSM, CDMA, GPRS, CDPD, fixed wireless broadband (LMDS), DBS satellite access technology, and Bluetooth, HomeRF, WCDMA, 3G, WLAN, and wireless optical system. From the user's perspective, www.2cto.com directly deals with wireless networks, regardless of the wireless LAN or wide area network, or how the wireless network is constructed, users can easily access the network as long as they have an appropriate wireless network card. Corresponding to a wide range of wireless access technologies, there are also a wide variety of wireless network cards, no matter what kind of access services the wireless network service provider provides, users only need to select the matching wireless network card, you can enjoy the wireless network service. You can classify wireless network adapters from different perspectives. In fact, most of the currently used wireless network adapters, GPRS wireless network adapters, and CDMA wireless network adapters are available, because many access technologies (including non-technical reasons) have not become dominant in the market for various reasons, there are no products to be put into the market. Interfaces are divided into interfaces used by wireless NICs, including PCI wireless NICs (including ISA interfaces), USB wireless NICs, and PCMCIA wireless NICs (including CF interfaces ). (1) PCI wireless network card uses PCI interface, mainly for desktops, further subdivided into real PCI wireless network card and PCI wireless network card adapter. The real PCI wireless Nic is a wireless NIC that uses PCI interfaces to provide wireless access functions. However, the PCI adapter itself cannot provide wireless access functions. Strictly speaking, it cannot be a wireless Nic, it only provides a conversion function. The PCMCIA Interface is available on the adapter, so that the PCMCIA wireless Nic can be inserted. (2) The Universal Serial Bus (Universal Serial Bus) Standard for USB wireless NICS is now the most popular standard for short-distance digital device interconnection, the theoretical maximum transmission rate of the USB interface can be 480 Mbps. (3) PCMCIA wireless network card corresponds to PCMCIA Interface, mainly for laptops. 2. functions are divided by functions. Wireless NICs can be divided into single-mode wireless NICs and dual-mode wireless NICs. Single-Mode wireless NICs can only provide wireless LAN access or wireless WAN Access, dual-mode wireless network card can achieve two access functions. Most wireless NICs are single-mode. 3. the speed can be divided into low-speed wireless NICs, medium-speed wireless NICs, and high-speed wireless NICs Based on the connection speed, with the development of technology and the improvement of transmission rate, NICS with high speed can only be divided into general wireless NICs.