3Com 3812 Getting Started Guide - Page 47
Solving Hardware Problems, Command Line Interface
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UPC - 662705470191
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Solving Hardware Problems 47 A link is connected and yet the Port Status LED for the port does not light Check that: ■ The Switch and the device at the other end of the link (or cable) are connected 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 or 1000BASE-T where auto-negotiation is disabled and incorrect cables are being used (cross-over or straight). Solving Hardware Problems In 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 received Your Switch has a fan monitoring system that will generate fan failure warning messages. Fan failure could potentially reduce the lifetime of the Switch. The monitoring system polls the fan status at periodic intervals while the unit is powered up. Should one or more fans fail within the Switch, a warning message will be generated in the following ways: ■ RMON Trap - if configured, an RMON trap is generated and sent to the management workstation. ■ Command Line Interface - an indication of a general hardware failure is provided through the Top level menu displayed when logging on to the CLI. For more detailed information about the failure select the system summary command. ■ Web Interface - an indication of fan failure is provided through the Device Summary table for the specific unit. In addition all Summary tables turn red to indicate the fan failure. The device mimic will also display red flashing fan icons. For further information about RMON, refer to "Chapter 7: Status Monitoring and Statistics" in the Switch Implementation Guide supplied in PDF format on the CD-ROM that accompanies the Switch.
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