3Com 4070 Getting Started Manual

Contents

3Com 4070 Getting Started Manual Manual pdf 56 page image

56 CHAPTER 4: P ROBLEM SOLVINGSolving ProblemsIndicated by LEDsIf the LEDs on the Switch indicate a problem, refer to the list of suggestedsolutions below.The Unit 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. Firstly, check the powercord by:■ testing it in another device■ connecting a working power cord to the ‘problem’ device■ installing and testing a second PSUthen contact your supplier for advice.On powering-up, the Unit Status lights yellowEither:■ The Switch unit has failed its Power On Self Test (POST) because of aninternal problem. The fault type will be indicated on the unit LEDs.Contact your supplier for advice.or■ A port has failed and has been automatically disabled. You can verifythis by checking that the Port Status LED is quickly flashing Yellow. If aport fails the Switch passes its Power on Self Test and continues tooperate normally.A Port Status LED is quickly flashing 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.The PSU LED lights red or flashing redThe PSU has failed or you may have a faulty power cord. Firstly, checkwhether a temporary fault has occurred by removing and replacing thepower cord connected to the PSU. If the problem still occurs, check thepower cord by:■ testing it in another deviceDUA1770-9AAA04.book Page 56 Monday, April 14, 2003 11:33 AM