Port Parameters

Fast EtherHub 3500 System 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 fans on back of the unit are 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.

Transmission Mode

If any devices are attached to the 100BASE-TX or FX SmartExtender Module, and operate at full duplex but do not support auto-negotiation, then you must manually set the transmission mode for this port on the hub. (Refer to Configuring

in Chapter 5.)

The default method of selecting the transmission mode for the 100BASE-TX and FX extender module is auto-negotiation. Therefore, if the Link signal is disrupted (e.g., by unplugging the network cable and plugging it back in again, or by resetting the power), the port will try to reestablish communications with the attached device via auto-negotiation. If auto-negotiation fails,

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Troubleshooting

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Accton Technology 12i, 12mi SNMP manual System Diagnostics, Power and Cooling Problems, Installation