–Thecableisinstalledcorrectly.
ThenetworkcablemustbesecurelyconnectedbothtotheEthernetconnectorofyourcomputerand
totheRJ45connectorofthehub.Themaximumallowabledistancefromthecomputertohubis
100meters.Ifthecableisconnectedandthedistanceiswithinacceptablelimitsbuttheproblem
persists,tryadifferentcable.
–Youareusingthecorrectdevicedriver.Toinstallthecorrectdriver,dothefollowing:
1.OpenControlPanelandclickHardwareandSound➙DeviceManager.Ifyouarepromptedfor
anadministratorpasswordorconfirmation,typethepasswordorprovideconfirmation.
2.Iftheexclamationmark!isdisplayednexttotheadapternameunderNetworkadapters,you
mightnotbeusingthecorrectdriverorthedrivermighthavebeendisabled.Toupdatethedriver,
right-clickthehighlightedadapter.
3.ClickUpdateDriverSoftware,andthenfollowtheinstructionsonthescreen.
–Theswitchportandtheadapterhavethesameduplexsetting.
Ifyouconfiguredtheadapterforfullduplex,makesurethattheswitchportalsoisconfiguredforfull
duplex.Settingwrongduplexmodecandegradeperformance,causedataloss,orresultinlost
connections.
–Youhaveinstalledallnetworkingsoftwarethatisnecessaryforyournetworkenvironment.
CheckwithyourLANadministratorforthenecessarynetworkingsoftware.
•Problem:Theadapterstopsworkingfornoapparentreason.
Solution:Thenetworkdriverfilesmightbecorruptormissing.Updatethedriverbyreferringtothe
previoussolutionfortheproceduretomakesurethatthecorrectdevicedriverisinstalled.
•Problem:MycomputerisaGigabitEthernetmodelandIuseaspeedof1000Mbps,buttheconnection
failsorerrorsoccur.
Solution:
–UseCategory5wiringandmakesurethatthenetworkcableissecurelyconnected.
–Connecttoa1000BASE-Thub/switch(not1000BASE-X).
•Problem:TheWakeOnLANfeatureisnotworking.
Solution:EnsurethatWakeOnLANisenabledinThinkPadSetup.Ifitis,checkwithyourLAN
administratorforthenecessarysettings.
•Problem:MycomputerisaGigabitEthernetmodel,butthecomputercannotconnecttothenetworkat
1000Mbps.Instead,itconnectsat100Mbps.
Solution:
–Tryanothercable.
–Makesurethatthelinkpartnerissettoauto-negotiate.
–Makesurethattheswitchis802.3ab-compliant(gigabitovercopper).
AwirelessLANproblem
Problem:Icannotconnecttothenetworkusingthebuilt-inwirelessnetworkcard.
Solution:Makesurethat:
•TheAirplanemodeisoff.
•YourwirelessLANdriveristhelatestversion.
•Yourcomputeriswithinrangeofawirelessaccesspoint.
Chapter8.Troubleshootingcomputerproblems103
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