Compaq HB1004 manual Power and Cooling Problems, Installation, Port and Cable Assignments

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B-2Troubleshooting

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 was 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 Compaq Technical Support at 1678-23143.

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.

Port and Cable Assignments

RJ-45 hub ports (MDI-X) can be attached to any device that uses a standard network interface (e.g., a workstation or server). Similar networking devices (e.g., another hub or switch) can be cascaded by connecting any of the RJ-45 ports (MDI-X) on the HB1004 hub to an MDI port on the other device. You can also set Port 4 on the HB1004 hub to MDI and connect to an MDI-X port on the other device. Use 100Ω Category 3, 4, or 5 twisted-pair cable, unshielded or shielded (UTP/STP), for all RJ-45 connections. Also be sure that the length of any twisted-pair connection does not exceed 100 meters (328 feet).