所属分类 > 设备应用 > 无线网卡 > 常见问题 根据现象判断故障 无线类 (Troubleshooting wireless networking issues - ThinkPad )

常见问题 根据现象判断故障 无线类 (Troubleshooting wireless networking issues - ThinkPad )

. 2015-12-06 13:23:06 | 知识编号: 021358

For the purpose of this guide the term Access Point is used for whatever wireless connectivity device is being used. This can be a wireless home gateway or an actual Access Point. Some of these steps may not apply to your computer. Test for network connectivity after performing each step.

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  1. Verify that the network adapter is being seen by the operating system.

    Check Microsoft Windows Device Manager and look for an icon that appears as Network Adapters and see if the network card listed in Mini-PCI information table is installed:





    1. Right-click the My Computer icon and select Properties.

    2. Click the Hardware tab and press the Device Manager button. The network card should appear under Network Adapters.
      Note: If the card has a exclamation mark over a yellow background then this is an indication that the card is experiencing a problem. Go to Driver download step 5.




  1. Verify that the radio is enabled.
    It is possible to disable the transmitter of the wireless card without Device Manager showing any problems. Most wireless cards will put an icon in the system tray (the line of icons in the lower right corner of your screen). Right click this icon and it may have a menu option to enable/turn on the wireless radio.



  2. Check for association to an Access Point.
    If you double-click the previously mentioned system tray icon the configuration utility of the wireless card will appear. This utility will be able to show the status of the wireless card showing what channel the card is using and what signal strength is being received. It may be difficult to maintain a connection if signal strength is low due to either interference or distance. For example interference can be caused by 2.4GHz cordless phones other Access Points in the area and physical structures such as load bearing walls or metal partitions.
    Note:
    The utility can be used to configure the wireless card settings but if using Windows XP Zero Configuration or Access Connections you will need to use those programs to actually configure the wireless card as they will overwrite the setting of the utility.



  3. Check the SSID (the Network name of the wireless network you are trying to connect to) and security settings.
    Note: The SSID and WEP key are case sensitive.



    • The connection will fail if the SSID is incorrect.

    • The most common security setting is the use of a WEP key. This involves using a 5 digit alphanumeric key for 64bit encryption or 13 digit alphanumeric key for 128bit encryption. Some systems will only allow a hexadecimal (0-9 A-F) key of either 10 (64bit) or 26 (128bit) characters. It may be necessary to convert your alphanumeric key to a hexadecimal one in order to connect properly. Click here for a conversion guide of Wireless configuration for encryption keys.
      Note: It may also be necessary to temporarily disable the security features in order to check for basic connectivity.



  4. Verify that the most recent driver for the adapter is installed.
    Note: Follow the installation instructions provided with the driver for proper functionality.




  5. Verify the hardware compatibility with the Access Point.
    Often vendors of Access Points will add features to improve their product. Unfortunately these extra features are not always compatible with all hardware. Consult the product documentation for the Access Point about the possible need to disable these features. Also there are often new firmware updates to an Access Point that may solve some issues. Again consult with the Access Point manufacturer for updates.



  6. Verify that TCP/IP (or other appropriate protocol) is properly installed.
    To check this:



    1. Right-click the My Network Places icon and select Properties. The wireless card should be present as Local Area Connection.

    2. Right-click the appropriate Local Area Connection and select Properties. In the Properties window make sure that the Internet Protocol (TCP/IP) is installed.

    3. If TCP/IP is not installed click Install click Protocol and then click TCP/IP.

    4. Once installed make sure that Obtain an IP address automatically and Obtain DNS server address automatically are checked (if using DHCP). To verify this highlight the TCP/IP protocol and select Properties.
      Note: Only use a Static IP Address if your network/Service Provider requires one.




  1. Verify the TCP/IP address.



    1. Click Start select Programs select Accessories and then click Command Prompt.

    2. Type the command ipconfig. This will list the IP address for the local machine.

    3. If this returns a 169.x.x.x or 0.0.0.0 address then type the following commands ipconfig /release and then ipconfig /renew. You should then receive a TCP/IP address appropriate to your network along with a Default Gateway address.

    4. Try to communicate with it by typing this command ping x.x.x.x where x.x.x.x is the IP address of the Default Gateway.

    5. If this does not give a reply (see the example in step 9) or you did not receive a TCP/IP address go to the next step.



  2. Ping the loopback address.



    1. Click Start select Programs select Accessories and then click Command Prompt.

    2. Type the command ping 127.0.0.1. This will send a message to the internal network stack on the machine. You should see a response like this:
      Pinging 127.0.0.1 with 32 bytes of data:

      Reply from 127.0.0.1: bytes=32 time<10ms TTL=128
      Reply from 127.0.0.1: bytes=32 time<10ms TTL=128
      Reply from 127.0.0.1: bytes=32 time<10ms TTL=128
      Reply from 127.0.0.1: bytes=32 time<10ms TTL=128

      Ping statistics for 127.0.0.1:
      Packets: Sent = 4 Received = 4 Lost = 0 (0% loss)
      Approximate round trip times in milliseconds:
      Minimum = 0ms Maximum = 0ms Average = 0ms



  3. Verify that the hardware is functioning using diagnostics.




  • Run diagnostics on the wireless card.
    Note: If using another manufacturer's product then consult it's documentation on how to run the diagnostics for the wireless card.

  • Run PC Doctor diagnostics on the network card included with the ThinkPad system by pressing the F11 key or the Access IBM button during startup to access the predesktop menu area. If this method is not available for your system then PC Doctor for DOS may be downloaded. This DOS version requires two or more floppy diskettes depending on the ThinkPad system.












    Go to download page for PC Doctor





  1. Verify that the wireless adapter is properly seated.
    Stop eject and reinsert PC Cards. This may not be possible with some integrated wireless cards. Consult the Service and Troubleshooting Guide or Access ThinkPad application for removal and installation instructions where available.



  2. Install latest Service Packs for Operating System or Network Client.
    It may be necessary to install Service Packs for either the operating system or for any additional network clients that may be installed. Contact the software vendor for these updates which are usually free downloads.



  3. If these steps have not solved your problem:










    Browse for other networking tips for your system
    or refer to Need more help?



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