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Troubleshooting
connections. See the documentation shipped with the HP AdvanceStack
8U/16U SNMP module and the software's online Help system for more
details about these tests and indicators.
Testing the Hub Only
If you believe that the hub is not operating correctly, you can test the hub's
circuitry by resetting the hub through one of these procedures:
Each of these procedures will power-cycle the hub and execute its self-test.
If all of the Port LEDs stay on after 3 seconds, the hub may have failed its
self-test. See "Diagnosing with the LEDs" earlier in this chapter to interpret
the LED display.
C a u t i o n
Cycling power on the hub will temporarily disable the network and
could have other adverse effects.
Testing Twisted-Pair Cabling
The twisted-pair cable attached to the hub must be compatible with the
IEEE 802.3 Type 10Base-T standard. To verify that your cable is compatible
with this standard, you can use the HP J2263A Cable Test Set. The older
HP 28687A Wire Test Instrument can also be used. HP also offers a wire
testing service. Contact your HP-authorized LAN dealer or your local HP
sales office for more information.
2-8
Unplug the power cord from the hub and plug the power cord into
the hub again.
If an HP AdvanceStack 8U/16U SNMP module is installed, select the
"Reset" option from the ASCII console.
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Table of Contents
Troubleshooting
