3-2
Troubleshooting
Basic Troubleshooting Tips
Because the Switch 408 behaves in this way (in compliance with
the IEEE 802.3u standard), if a device connected to the switch
has a fixed configuration at full duplex, the device will not
connect correctly to the Switch 408. The result will be high error
rates and high collision rates, and very inefficient communica-
tions between the switch and the device.
Make sure that all devices connected to the Switch 408 are
configured to auto negotiate, or are configured to connect at half
duplex (all hubs are configured this way, for example).
■ Faulty or loose cables. Look for loose or obviously faulty
connections. If they appear to be OK, make sure the connections
are secure. If that does not correct the problem, try a different
cable.
■ Non-standard cables. Non-standard and miswired cables may
cause numerous network collisions and other network problems,
and can seriously impair network performance. Use a new
correctly-wired cable or compare your cable to the cable in
appendix B, “Cables and Connectors” for pinouts and correct
cable wiring. A category 5 cable tester is a recommended tool for
every 100Base-T network installation.
■ Improper Network Topologies. It is important to make sure
you have a valid network topology. Common topology faults
include excessive cable length and too many repeaters (hubs)
between end nodes. If you have network problems after recent
changes to the network, change back to the previous topology. If
you no longer experience the problems, the new topology is
probably at fault. Refer to the Network Design Guide for topology
configuration guidelines. This guide can be found online at the
ProCurve Networking web site, http://www.procurve.com. You
can find it quickly by searching for “Network Design Guide”.
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