3Com 3812 - SuperStack 3 Switch Getting Started Manual

Also see for 3C17400: Getting started guide Implementation guide Implementation guide Datasheet

Contents

3Com 3812 - SuperStack 3 Switch Getting Started Manual Manual pdf 46 page image

46 CHAPTER 4: P ROBLEM SOLVINGSolving ProblemsIndicated by LEDsIf the LEDs on the Switch indicate a problem, refer to the list of suggestedsolutions below.The Power or Power/Self Test LED does not lightCheck that the power cable is firmly connected to the Switch and to thesupply outlet. If the connection is secure and there is still no power, youmay have a faulty power cord or an internal fault. Check the power cordby:■ Testing it in another device■ Connecting a working power cord to the ‘problem’ deviceThen contact your supplier for advice.On powering up, the Power/Self Test LED lights yellow for about tenseconds after which it starts flashing green (Switch 3848 only).On powering-up, the Self Test LED lights red (Switch 3812 andSwitch 3824) or Power/Self Test LED remains yellow (Switch 3848)This indicates one of the following:■ A port has failed and has been automatically disabled. You can verifythis by checking that the Port Status LED is flashing Green/Yellow(fast). This could be due to a loop back failure. If a port fails the Switchpasses its Power On Self Test and continues to operate normally.■ An internal fan has malfunctioned. If a fan has stopped spinning,power off the unit and check the air vents for obstructions. If thissituation occurs, the fault LED will light red (Switch 3848 only).■ The internal PSU has failed and power is being supplied by an externalRedundant Power Supply (RPS). Although the Switch has a fault it willcontinue to operate normally.On Powering up, the Power/Self Test LED lights yellow for about tenseconds after which it starts flashing green. This is normal and does notindicate any of the above conditions. (Switch 3848 only)A Port Status LED is flashing green/yellowThe port has failed and has been automatically disabled. The Switchpasses its Power On Self Test and continues to operate normally, even ifone or more ports are disabled.dua1740-0aaa03.book Page 46 Thursday, December 23, 2004 9:23 PM