Lenovo 20JW, User Manual, Page: 107 / 176

Solution :
Ensure that:
– The cable is installed correctly.
The network cable must be securely connected both to the Ethernet connector of your computer and
to the RJ45 connector of the hub. The maximum allowable distance from the computer to hub is 100
m (328 ft). If the cable is connected and the distance is within the acceptable limits but the problem
persists, try a different cable.
– You are using the correct device driver. To install the correct driver, do the following:
1. Go to Control Panel, and ensure that you view Control Panel by Category.
2. Click Hardware and Sound ➙ Device Manager . If you are prompted for an administrator
password or confirmation, type the password or provide confirmation.
3. Double-click Network adapters to view all network adapters. If an exclamation mark ! is
displayed next to the adapter name, you might not be using the correct driver or the driver might
have been disabled.
4. Right-click the highlighted adapter, click Update Driver Software , and then follow the instructions
on the screen to update the driver.
– The switch port and the adapter have the same duplex setting.
If you configured the adapter for full duplex, ensure that the switch port also is configured for full duplex.
Setting a wrong duplex mode can degrade performance, cause data loss, or result in lost connections.
– You have installed all networking software that is necessary for your network environment.
Check with your LAN administrator for the necessary networking software.
• Problem : The adapter stops working for no apparent reason.
Solution : The network driver files might be corrupt or missing.
• Problem : My computer is a Gigabit Ethernet model and I use a speed of 1000 Mbps, the connection fails
or errors occur.
Solution :
– Use Category 5 wiring and ensure that the network cable is securely connected.
– Connect to a 1000 BASE-T hub/switch (not 1000 BASE-X).
• Problem : The Wake on LAN feature is not working.
Solution : Ensure that Wake on LAN is enabled in ThinkPad Setup. If it is, check with your LAN
administrator for the necessary settings.
• Problem : My computer is a Gigabit Ethernet model, but it cannot connect to the network at 1000 Mbps.
Instead, it connects at 100 Mbps.
Solution :
– Try another Ethernet cable.
– Ensure that the link partner is set to auto-negotiate.
– Ensure that the switch is 802.3ab-compliant (gigabit over copper).
Wireless-LAN problem
Problem : I cannot connect to the network using the built-in wireless network card.
Solution :
Ensure that:
Chapter 7
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Troubleshooting computer problems
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