Acer ALH-608ds - Manual (Page 17)

2.3.5 If you are trying to connect more cables to the hub, please follow
procedures from section 2.3.2 to 2.3.4.
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 .
2-9 User's Manual
Figure 2-12 Check the Link LEDs both on hub and adapter card
Figure 2-13 LED overview
608-UM 1/8/99 2:34 PM ≠∂≠ ±15