3Com 4200G Getting Started Manual

Also see for 4200G Series: Product guide Quick reference guide Datasheet Installation guide Product guide

Contents

58 CHAPTER 4: PROBLEM SOLVINGSolving ProblemsIndicated by LEDsIf the LEDs on the switch indicate a problem, refer to the list of suggestedsolutions below.The PWR 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. First check the powercord by:■ testing it in another device.■ connecting a working power cord to the ‘problem’ device thencontact your supplier for advice.On powering-up, the PWR LED lights RedThe 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.On powering-up, the PWR LED is flashing yellowA port has failed and has been automatically disabled. You can verify thisby checking that the Port LED is quickly flashing Yellow. If a port fails, theswitch passes its Power On Self Test and continues to operate normally.A Port LED is 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.A link is connected and yet the Port LED does not lightCheck that:■ The switch and the device at the other end of the link (or cable) areconnected securely.■ The devices at both ends of the link are powered-up.■ The quality of cable is satisfactory.■ Auto-negotiation settings are the same at both ends.