3Com SUPERSTACK 3 3870 Series Getting Started Manual

Also see for 3CR17450-91: Datasheet Getting started guide

Contents

50 CHAPTER 4: P ROBLEM SOLVINGA 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.Should one or more fans fail within the Switch, a warning message willbe generated in the following ways:■ RMON Trap — if configured, an RMON trap is generated and sent tothe management workstation.■ Command Line Interface — an indication of a general hardwarefailure is provided through the Top level menu displayed when loggingon to the CLI. For more detailed information about the failure selectthe system summary command.■ Web interface — an indication of fan failure is provided through theDevice Summary table for the specific unit. In addition all Summarytables turn red to indicate the fan failure. The device mimic will alsodisplay red flashing fan icons.For further information about RMON, refer to “Chapter 7: StatusMonitoring and Statistics” in the Switch Implementation Guide suppliedin PDF format on the CD-ROM that accompanies the Switch.If a fan failure warning message is generated:1 Power off the unit.2 Check that the air vents are not obstructed.3 Power cycle the unit. To do this, remove and reconnect the AC mainssupply.4 If a fan fail trap is still received, return the unit.Unit fails or SNMP thermal shutdown trap is received1 Power cycle the unit. To do this, remove and reconnect the AC mainssupply.2 Check the command line interface (system summary command) todetermine whether a thermal shutdown has occurred.3 If no, return the unit:If yes, check that:■ The air vents are not obstructed.DUA1745-0AAA02.book Page 50 Monday, August 9, 2004 11:51 AM