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B-2
Troubleshooting
Writer:
Weldon W. Rowan
Project:
Troubleshooting
Comments:
File Name:
SAB_B.DOC
Last Saved On:
7/2/98 2:37 PM
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).