Acer ALH-616ds User Manual page 13

2.2.2 If you are installing more than one hub, please turn off the power of
all hubs first. Then you can get another hub and place it above the previous
one on the working surface, as shown in Figure 2-7. Finally, put the stacking
kit inthe middle of two sides and click into the stacking hole in the plastic
housing.Check if all hubs are tightly fastened by the stacking kits and proceed
to next step.
Figure 2-7 Unplug the power,and stack two hubs together
Figure 2-6 Lay hub on stable desktop
AcerSOHO
Series
AcerSOHO
Series