Acer ALH-616ds - Manual (Page 17)

Figure 2-12 Check the Link LEDs both on hub and adapter card
2.4 Does the hub work well?
You can observe the LED status to see if the hub works fine. The meanings
of LEDs are defined in section 2.4.1.
2.4.1 LED overview
The locations of LED indicators are shown in Figure 2-13.
Figure 2-13 LED overview
ACT
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ALH-616ds