3Com 4500G Getting Started Manual

Also see for 4500G Series: Product guide Product guide Product guide Configuration guide Getting started guide

Contents

3Com 4500G Getting Started Manual Manual pdf 59 page image

Solving Hardware Problems 59Auto-negotiation problems will occur with 10BASE-T or 100BASE-Twhere auto-negotiation is disabled and incorrect cables are being used(cross-over or straight).Auto-negotiation problems will occur with fiber if:■ The Receiver (RX) and Transceiver (TX) cable connectors are swapped■ Fibers are broken■ Auto-negotiation differs at either end (a link appears at the ‘fixed’end and not at the auto-negotiation end)Solving HardwareProblemsIn the rare event of your switch unit experiencing a hardware failure, referto the list of suggested solutions below.A fan failure warning message is receivedYour switch has a fan monitoring system that will generate fan failurewarning messages. Fan failure could potentially reduce the lifetime of theswitch. The monitoring system polls the fan status at periodic intervalswhile the unit is powered up.If one fan has failed in the switch, a warning message will be generated inthe following ways:■ Unit LEDThe seven segment display will show a green flashing ‘f’.■ RMON TrapIf configured, an RMON trap is generated and sent to the managementworkstation.■ Command Line InterfaceAn indication of a general hardware failure is provided through the Toplevel menu displayed when logging on to the CLI. For more detailedinformation about the failure select the display logbuffercommand.■ Web interfaceAn indication of fan failure is provided through the Device Summarytable for the specific unit. In addition all Summary tables turn red toindicate the fan failure.