3Com 2426-PWR Installation And User Manual

Also see for 2226-SFP Plus: User guide

Contents

76 C HAPTER 5: TROUBLESHOOTINGThe Switch will perform automatic IP configurationafter you reset it. See “Automatic IP Configuration” onpage 37 for more information.Forgotten Static IP AddressIf you have forgotten the static IP address that you haveassigned to the Switch and you need to access the Webinterface, you can use the console interface. Use thesummary command once you logged in to display the IPsettings of the switch. Alternately, use the 3Com Detectapplication (page 31) to locate the Switch on your net-workSolving LED IssuesThis section lists some issues that are related to the LEDson the front panel of the Switch. For information onbasic LED checks, refer to the following topics inChapter 1:■ (2) Gigabit Combo Ports (RJ-45/SFP)■ (4) 10/100BASE-TX Link/Activity Status LEDs■ (7) Power LEDA link is connected, but the Link/ActivityLED for the port is off.There is a problem with this connection. Verify that:■ The device being connected to is powered on andoperating correctly.■ The cable is connected at both ends.■ The cable is not damaged.■ If the connection is to a workstation, that the work-station's network interface is installed and config-ured correctly.■ The correct category of cable is being used for therequired link speed. Category 3 cables can be usedfor 10BASE-T operation only. Category 5 cable isrequired for 100BASE-TX or 1000BASE-T. 3Com rec-ommends Category 5e or 6 cables for 1000BASE-Toperation.A fiber cable is connected, but the ModuleActive LED is off.Verify that:■ The fiber cable is in good condition.■ The SFP module is correctly inserted.■ A 3Com SFP module is being used. Refer to“Approved SFP Transceivers” on page 22 for details.■ The equipment at the far end is installed and cor-rectly configured.