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A
T
ROUBLESHOOTING
D
IAGNOSING
S
WITCH
I
NDICATORS
T
HE
P
OWER
LED
IS
O
FF
◆
Make sure the AC-DC power adapter is connected to the switch and power
source properly.
◆
Make sure the power source is ON.
T
HE
L
INK
/A
CT
LED
IS
O
FF
WHEN
A
D
EVICE
IS
C
ONNECTED
TO
THE
C
ORRESPONDING
P
ORT
◆
Make sure that the cable connectors are firmly plugged into the switch and
the device.
◆
Make sure the connected device is turned on and working properly.
◆
The cable must be less than 100 meters long (328 feet).
◆
Check the port on the attached device and cable connections for possible
defects. Replace the defective cable if necessary.
P
OWER
AND
C
OOLING
P
ROBLEMS
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 AC-DC power
adapter. However, if the unit powers off after running for a while, check for loose
power connections, power losses or surges at the power outlet. If you still
cannot isolate the problem, the internal power supply may be defective.
