Solving Hardware Problems - 3Com 4500G Getting Started Manual

Solving Hardware
Problems
Auto-negotiation problems will occur with 10BASE-T or 100BASE-T
where 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)
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.
If one fan has failed in the switch, a warning message will be generated in
the following ways:
Unit LED
■
The seven segment display will show a green flashing 'f'.
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 display logbuffer
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.

Solving Hardware Problems

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