3Com 4200G Series, Руководство по началу работы

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Solving Hardware Problems 59
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 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 Hardware
Problems
In the rare event that your switch unit experiences 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 shows 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 onto the CLI. For more
detailed information about the failure issue 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.
10014914_AB_Switch 4200G.book Page 59 Tuesday, October 2, 2007 12:13 PM