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 Wireless LAN
Why couldn't my wireless notebook work on-line after checking ?



Generally, Wireless networks can sometimes be very complicated to set up, particularly if you're dealing with encryption and products from different vendors. Any number of variables can keep your workstations from talking to each other. Let's go over some of more common ones.

For starters, verify that your router and your workstation are using the same SSID descriptions. SSID acts as a password when a mobile device tries to connect to the wireless network. The SSID also differentiates one WLAN from another, so all access points and all devices attempting to connect to a specific WLAN must use the same SSID. A workstation will not be permitted to connect to the network unless it can provide this unique identifier. This is similar to the function of your network's Workgroup or Domain name.

When you're experiencing conductivity problems, it is always best to keep things simple. So next you are going to do is that, please disable any WEP encryption you might have configured.

Successful implementation of encryption also includes the use of a shared key. A HEX key is the most common, but other formats are also used. This key identifies the workstation to the router as a trusted member of this network. Different manufacturers can implement this key technology in ways that might prevent them from working correctly with another vendor's products. So pay attention to detail is going to be the key to a successful installation.

Next make sure the router and the NIC are configured to use the same communications channel. There are normally 11 of them, and the default channel can also vary from vendor to vendor. You might also want to confirm that the router has DHCP services enabled and an address pool configured. If not, the NIC won't be able to pick up an IP address. I have run across a few access points that offer DHCP services but do not assign all of the needed IP information to the NIC. As a result, I was able to connect to the network, but could not browse the web. The point is, don't assume anything. Verify for yourself that all of the required settings are being received by the workstation.

Finally, you might want to keep the system you're trying to configure in the same room as the router, at least during the initial configuration, in order to minimize potential interference from concrete walls or steel beams.

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My PC can't locate the Wireless Access Point.

Check the following:

•  Your PC is set to Infrastructure Mode.
    (Access Points are always in Infrastructure Mode.)

•  The SSID on your PC and the Wireless Access Point are the same. Remember that the
     SSID is case-sensitive. So, for example ¡§Workgroup¡¨ does NOT match ¡§workgroup¡¨.

•  Both your PC and the Wireless Access Point must have the same setting for WEP. The
     default setting for the Wireless Router is disabled, so your wireless station should also
     have WEP disabled.

•  If WEP is enabled on the Wireless Router, your PC must have WEP enabled, and
    the key must match.

•  If the Wireless Router's Wireless screen is set to Allow LAN access to selected
    Wireless Stations only, then each of your Wireless stations must have been selected,
    or access will be blocked.

•  To see if radio interference is causing a problem, see if connection is possible when
    close to the Wireless Access Point. Remember that the connection range can be
    as little as 100 feet in poor environments.

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Wireless connection speed is very slow.

The wireless system will connect at highest possible speed, depending on the distance and the environment. To obtain the highest possible connection speed, you can experiment with following:

•  Access Point location: Try adjusting the location and orientation of the Access Point.
•  Wireless Channel: If interference is the problem, changing to another channel may show
     a marked improvement.
•  Radio Interference: Other devices may be causing interference. You can experiment by
     switching other devices off, and see if this helps. Any ¡§noisy¡¨ devices should be shielded
     or relocated.
•  RF Shielding: Your environment may tend to block transmission between the wireless
     stations. This will mean high access speed is only possible when close to the
     Access Point.

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Some applications do not run properly when using the Wireless Router.

The Wireless Router processes the data passing through it, so it is not transparent. Use the Special Application feature to allow the use of Internet applications which do not function correctly. If this does solve the problem, you can use the DMZ function. This should work with almost every application, but:

•  It is a security risk, since the firewall is disabled.
•  Only one (1) PC can use this feature.

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I can't connect to the Wireless Router to configure it.

Check the following:

•  The Wireless Router is properly installed, LAN connections are OK, and it is
    powered ON.
•  Make sure that your PC and the Wireless Router are on the same network segment.
•  If your PC is set to ¡§Obtain an IP Address automatically¡¨ (DHCP client), restart it.

If your PC uses a Fixed (Static) IP address, make sure that it is using an IP Address within the range 192.168.1.129 to 192.168.1.253 and thus compatible with the Wireless Router's default IP Address of 192.168.1.254. Also, the Network Mask should be set to 255.255.255.0 to match the Wireless Router. In Windows, you can check these settings by using Control Panel ~ Network to check the Properties for the TCP/IP protocol.

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The WinXP wireless interface couldn't communicate the WEP with the router's
       wireless interface.

The default WEP of WinXP is Authentication Open System - WEP , but the WEP of the router is only for Shared Key - WEP , it caused both sides couldn't communicate. Please select the WEP of WinXP from Authentication Open System to Pre-shared Key - WEP , and then the WEP wireless interface between WinXP and the router would be communicated.

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