3-5
Troubleshooting
Hardware Diagnostic Tests
Hardware Diagnostic Tests
Testing the Switch by Resetting It
If you believe that the switch is not operating correctly, you can reset
the switch to test its circuitry. To reset the switch, unplug and plug in
the adapter’s power cord (power cycling).
Power cycling causes the switch to perform its power-on self-test, and
almost always will resolve any temporary operational problems.
Checking the Switch LEDs
The self-test passes if the Fault LED on the front of the switch goes
off after approximately 3 seconds. If this LED stays on longer than 5
seconds, an error condition has been detected on the switch.
See “Diagnosing With the LEDs” on page 3-3 for information on
interpreting the LED patterns.
Testing Twisted-Pair Cabling
If you think the cable should work but still isn’t working, it may not
be compatible with the IEEE 802.3 Type 10Base-T or 100Base-TX
standards. The twisted-pair cables attached to the Switch 408 must
be compatible with these standards. To verify that your cable is
compatible with these standards, use a qualified cable test device.
ProCurve also offers a wire testing service. Contact your ProCurve
authorized LAN dealer or your local ProCurve sales office for more
information.
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