Wireless networkCard (English name: Wireless network interface controller, abbreviated as WNIC) is a terminal wirelessnetwork equipment , which helps your computer connect towireless networkOn, such as WiFi orBluetooth。In other words, the wireless network card is a device that helps your computer connect to the wireless network. However, with the wireless network card, you also need a wireless network that can be connected, so you need to cooperatewireless routerOr use wireless AP.[1]
The wireless network card is aWireless LANPass under the cover ofWireless connectionWireless access to the Internetterminal equipment。Generally speaking, the wireless network card is a device that can access the Internet without connecting the network cable. For example, our most common laptopsIntelligent mobile phone、tablet PCetc.ElectronicsThe wireless network card is integrated internally, so how to use the wireless network card?[2]
The wireless network card is mainly divided into built-in integrated wireless network cards, such as laptops, smart phones and other internal integrated wireless network cards;The other is the external wireless network card, such as the commonUSB wireless network card, PCI wireless network card, etc. When the user's notebook built-in wireless network card is damaged orDesktop computerneedWireless Internet AccessThe external wireless network card comes in handy.[2]
The normal operation of the built-in or external wireless network card in the computer requires the use of wireless network signals or AP signals, which are realized by the wireless router, that is, the wireless network card is just a wireless signalReceiver, and a router wireless network needs to be set up near the computer to access the Internet normally.The biggest advantage of router wireless network is its affordable price and stable signal. The disadvantage is that it can only be used in the fixed place where it is erected.For example, if there is a wireless router at home, our smart phones, laptops or desktops with an external USB wireless network card can only use wireless Internet access at home. Because the wireless network signals formed by wireless routers are not far away.[2]
Setting method
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Usually, the built-in wireless management mechanism can meet the setting requirements, but for high demand users, they want to get a better experience.for convenienceuser management wireless networkMany brands of computers provide special wireless card management software, such asassociation、Dell、HP, Acer and other brand notebooks have special wireless network management tools, through which you can easily set up and manage wireless networks.[3]
The wireless network card can beInterface typeThe first isUSBWireless network card, is currently the most common;The second is dedicated to desktop computersPCIInterface wireless network card;The third isNotebook computerappropriativePCMCIAInterface wireless network card;The fourth is the MINI-PCI wireless network card built in the laptop.[1]
As mentioned above, the wireless network card can be divided into several types according to different interfaces. The following describes the classification according to users: one is the PCI interface wireless network card dedicated to desktop computers;One is the PCMCIA interface network card dedicated to notebook computers;One is USB wireless network card,USB wireless network cardWhether desktop users or notebook users, as long as theDriver, can be used.It should be noted that only the wireless network card with USB2.0 interface can meet the requirements of 802.11g or 802.11g+.In addition, there is the MINI-PCI wireless network card widely used in notebook computers.MINI-PCI is a built-in wireless network card,GallopThis wireless network card is used for both models and non Centrino wireless network card standard models.Its advantage is that it does not need to occupy a PC card or USB slot, and it avoids the trouble of carrying a PC card or USB card with you at any time.The price of these wireless network cards is not very different, and their performance/functions are similar. You can choose them as needed.[1]
Wireless network card standard
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WLAN Introduction
Wireless LANSince its birth, Wireless Local Area Network (WLAN) has developed rapidly and has broad prospects for development because of its superior flexibility and convenience.The so-called WLAN refers to the use of radio frequency (radio frequency:RF）Orinfrared（Infrared：IR）Technology, to connect two or more computer devices that need to exchange data in a wireless way.It is generally composed of wireless network cardWireless access point(AP), computer and related equipment, where AP isAccess PointIs generally translated as "wireless access node", which is mainly used to provide wireless workstationWired LANAnd access to wireless workstation from wired LANAccess pointCoverageThe wireless workstations in the can communicate with each other through it.[4]
eight hundred and two point one oneThe original version of the standard series was officially approved by IEEE International Institute of Electronics and Electrical Machinery in 1997, which is the first internationally recognized protocol.Media access was defined in the original releaseaccess control Layer（MAC layer）And physical layer, totalData transmission rateThe design is 2Mbps.The communication between two devices can be carried out freely and directly (ad hoc), or in the base station (BS) orAccess point(Access Point, AP).In order to resolve conflicts and achieve good communication quality in different communication environments, CSMA/CA (Carrier Sense Multi Access/Collaboration Avoidance) hardware communication mode is adopted.After that, IEEE successively released several improved versions, including the802.11a, defined aISM bandData ontransmission speed Up to 54Mbpsphysical layer；802.11b, defines a physical layer with a data transmission rate of 11Mbps on the 2.4GHz IS band.And a series of standards from 802.11c to 802.11m.802.11g achieves a transmission rate of 54Mbps in the 2.4GHz ISM band.While the802.11nThe maximum transmission rate is 600Mbps.[4]
Troubleshooting
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Nowadays, many notebooks have their own wireless network card devicesWired networkThe wireless network card can help us access the Internet more flexibly.However, after working for a period of time, the wireless network card is often easy to strike.When many people encounter strikes, they are often in a hurry and don't know how to deal with them.The following is a summary of some tips in this regard:[5]
Unrecognized
1. Whether the network card is inserted in place
At present, wireless network cards mainly includePCI、USB、PCMCIAThreeInterface type, regardless of the type, it must be inserted in place to ensure that the network card is in close contact with the computer slot or port;If it is not inserted properly, the wireless network card cannot besystem identification To.Therefore, when you encounter a fault that cannot be recognized by the wireless network card, you can check whether the network card is closely connected to the computer according to the type of interface card.[6]
2. Whether USB port is enabled
When installing the wireless network card with USB interface, if the USB port on the computer motherboard is set to disable in advance, no matter what measures you take, the wireless network card cannot be correctly identified.Therefore, checking whether the USB port on the motherboard is "enabled" is one of the important measures to eliminate the problem that the USB wireless network card cannot be recognized.[6]
Unable to assign IP
First, check the wireless workstation andLANInWireless access pointWhether the connection between is established successfully.Sometimes, no matter how strong the wireless reception signal is, the wireless access point can also refuse the connection or identification request of the wireless workstation.For example, if the wireless access point is busy or its communication rate and other Internet access parameters do not match the wireless workstation, it will refuse the wireless workstation to establish a communication connection with it.[7]
If the wireless workstation has successfully passed the identification verification of the wireless access point, but the wireless network card is still unable to use the built-inDHCP ServerEffectiveIP addressIf so, it is necessary to check whether the DHCP server built in the wireless access point can work normally.[7]
Bluetooth signal interference
Sometimes in useBluetoothHeadphone or mouse may cause inaccessiblewireless networkThe root cause may be the interference between the Bluetooth signal and the wireless network card signal. To solve the problem, the wireless network card and thewireless routerOfCommunication frequencySet to 5GHz, and let these devicesEach goes his own wayThey do not interfere with each other.A lot of wireless nownetwork equipment All support 5GHzworking frequency 。For XP users, the wireless network card can be used very smoothly, but when upgrading toWindows 7/8. After the system is completedDriverThe wireless network card cannot be used successfully due to the problem of.The solution is not complicated, and is drivingerection sequenceOpen in the properties window of“compatibility”Panel, select "Run this program in compatibility mode" to install the driver successfully.[8]
