3-4
Troubleshooting
Hardware Diagnostic Tests
T
rou
bleshoo
ting
Hardware Diagnostic Tests
Testing the Hub by Resetting It
If you believe that the hub is not operating correctly, you can reset it to test
its circuitry and operating code. To reset a hub, either:
■
Unplug and plug back in the power cord (power cycle)
■
Press the reset button on the front of the hub
Power cycling the hub and pressing the Reset button both cause the hub to
perform its power-on self-test, which almost always will resolve any tempo-
rary operational problems.
The self-test passes if the Fault LED on the front of the hub goes off after
approximately 3 seconds. If the Fault LED stays on longer than 3 seconds, the
hub may have to be replaced. Contact your HP-authorized dealer or HP
representative for assistance.
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 IEEE 802.3u 100Base-T
standards. The twisted-pair cables attached to the HP 10/100 hub must be
compatible with these standards.To verify that your cable is compatible with
these standards, use a qualified cable test device.
HP also offers a wire testing service. Contact your HP-authorized LAN dealer
or your local HP sales office for more information.
N o t e
Make sure that you are using the correct cabling type for each connection.
The hub ports are all wired as MDI-X. For connecting end nodes and other
MDI-type devices, use “straight-through” cable. For connecting switches,
other hubs, and other MDI-X devices, use “crossover” cable. See Appendix B,
“Cables and Connectors” for the pinouts for these cables.
Roadhw0.bk : ROADHW3.FM Page 4 Thursday, May 28, 1998 5:40 PM
