User`s guide

CheetaHub Power-3012A User’s Guide
A-2 Troubleshooting
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 100
W 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. This is a Class I hub and cannot be connected to another hub via any of the
RJ-45 ports on the front panel. If you must connect to another hub, you can
use one of the optional switch modules.
4. If you want to connect to a switch, use an RJ-45 MDI to MDI-X connection.
If you must cascade to a switch using MDI-X ports at both ends of the cable