3Com 3812 - SuperStack 3 Switch Getting Started Manual

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

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3Com 3812 - SuperStack 3 Switch Getting Started Manual Manual pdf 47 page image

Solving Hardware Problems 47A link is connected and yet the Port Status LED for the port doesnot 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.Auto-negotiation problems will occur with 10BASE-T, 100BASE-TX or1000BASE-T where auto-negotiation is disabled and incorrect cablesare being used (cross-over or straight).Solving HardwareProblemsIn the rare event of your Switch unit experiencing a hardware failure,refer to 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.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.dua1740-0aaa03.book Page 47 Thursday, December 23, 2004 9:23 PM