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normally.
3)1000Mbps LED: When a GIGA port is connected to a 1000Mbps device, the corresponding LED turns on in solid green; when the port is connected to a 10/100Mbps device, the LED turns off.
4)Link/Act LED: Will be solid green when a valid link is established on the port; Flashes green when packet transmission or reception is occurring on the port.
5)FAN LED: FAN1 indicates the right fan, FAN2 indicates the left fan, and they will be solid green when the corresponding fan is operating normally.
Following shows the front panel of 
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Power 
 FAN2
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System 
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 FAN1
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Figure 3-3  TL-SG2224WEB  Front Panel
3.2.2 Back Panel
The back panel of the switch is configured as follows:
Figure 3-4  TL-SG2216WEB/TL-SG2224WEB  Back Panel
AC Power Connector: This is a