5-12
Troubleshooting
Hardware Diagnostic Tests
Power cycling the switch, pressing the System Reset button, and the software
reset or reboot options all cause the switch to perform its power-on self-test,
which almost always will resolve any temporary operational problems. These
reset processes also cause any network traffic counters to be reset to zero and
cause the System Up Time timer to reset to zero. Neither of these reset
procedures causes any changes to the switch configuration.
Checking the Switch LEDs
The self-test passes if the Fault and Test LEDs on the front of the switch go
off after approximately 90 to 150 seconds depending on the number and type
of modules installed in the switch. If these LEDs stay on longer than 180
seconds or begin blinking, the switch, or a module, or an individual transceiver
may have to be replaced as indicated by the LEDs.
See “Diagnosing With the LEDs” on page 5-4 for information on interpreting
the LED patterns.
Checking Console Messages
Useful diagnostic messages may be displayed on the console screen when the
switch is reset. As described in chapter 2 under step 8, “Connect a Console to
the Switch”, connect a PC running a VT-100 terminal emulator program or a
standard VT-100 terminal to the switch’s Console Port and configure it to run
at 9600 baud and with the other terminal communication settings shown on
page 2-23. Then, when you reset the switch, note the messages that are
displayed.
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