User`s guide

CheetaHub Power-3012A User’s Guide
Troubleshooting A-3
(i.e., not the MDI port), make sure a crossover cable is used. Crossover cable
should only be used if an MDI daisy-chain port is not available. Also note
that the maximum cable length for a fiber optic connection is 2 kilometers
(1.24 miles) for full duplex and 412 meters (0.25 miles) for half duplex.
Transmission Mode
When you use an optional switch module, verify that the attached device
supports auto-negotiation if it must operate at full duplex.
External Adapters
Make sure the network interface hardware and software drivers for the attached
devices are function properly. Check the adapter cards and associated drivers
used in any attached workstation or server.
Physical Configuration
If problems occur after altering the network configuration, restore the original
connections, then try to track the problem down by implementing the new
changes, one step at a time. Ensure that cable distances and other physical
aspects of the installation do not exceed recommendations.
System Integrity
As a last resort verify the hub’s integrity with a power-on reset. Turn the
power to the hub off and then on a few times. If the problem still persists and
you have completed all the preceding diagnoses, contact your Accton
distributor for further assistance. (Refer to Appendix E.)