Fast EtherHub-12s User’s Guide

System Diagnostics

Power and Cooling Problems

If the Power indicator does not turn on when the power cord is plugged in, you may have a problem with the power outlet, power cord, or internal power supply as explained in the previous section. However, if the unit powers off after running for a while, check for loose power connections, power losses or surges at the power outlet, and verify that the fan on back of the unit is unobstructed and running prior to shutdown. If you still cannot isolate the problem, then the internal power supply may be defective. In this case, contact your Accton distributor for assistance.

Installation

Verify that all system components have been properly installed. If one or more components appear to be malfunctioning (e.g., the power cord or network cabling), test them in an alternate environment where you are sure that all the other components are functioning properly.

Cabling

1.Verify that the cabling type is correct. Be sure all cable connectors are securely seated in the required ports. Use 100W Category 5 straight-through cable for all standard twisted-pair connections.

2.Make sure all devices are connected to the network. Equipment may have been unintentionally disconnected from the network.

3.When cascading two devices using RJ-45 station ports at both ends of the cable (i.e., not the MDI port), make sure a crossover cable is used. Crossover cable should only be used if a daisy-chain port is not available.

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Troubleshooting

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Accton Technology FAST ETHERHUB-12S manual System Diagnostics, Power and Cooling Problems, Installation