American Fibertek SM9p - Manual (Page 181)

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 Improper Network Topologies
It is important to make sure that you have a valid network topology. Common topology
faults include excessive cable length and too many repeaters (hubs) between end nodes.
In addition, you should make sure that your network topology contains no data path loops.
Between any two ends nodes, there should be only one active cabling path at any time.
Data path loops will cause broadcast storms that will severely impact your network
performance.
Diagnosing LED Indicators
The Switch can be easily monitored through panel indicators to assist in identifying
problems, which describes common problems you may encounter and where you can find
possible solutions.
IF the power indicator does turn on when the power cord is plugged in, you may have a
problem with power outlet, or power cord. However, if the Switch powers off after running
for a while check for loose power connections, power losses or surges at power outlet. IF
you still cannot resolve the problem, contact your local dealer for assistance.