Mounting the cabinet(s) If wall-mounted, the system and supporting components should be mounted to a half-inch (or thicker) plywood backboard. To wall-mount a Base Cabinet or Expansion Cabinet, use the five tabs located at the rear of the cabinet. The center tab has an enlarged hole and slot, to allow you to fix the screw on the wall before hanging the cabinet onto the screw. Once you’ve done so, fasten the other screws into the four remaining holes to finish securing the cabinet onto the wall. To rack-mount a Base Cabinet or Expansion Cabinet, use the forward-facing screw holes on the sides of the cabinet. Only two screws are needed per side (in fact, on most server racks, you can’t use all four screws on each side). Allow room for installation of the Expansion Cabinet either now or in the future; the Expansion Cabinet must be installed directly below the Base Cabinet. Allow about two inches of clearance between the units, for cabling. Attach the power transformer to the wall or rack, allowing sufficient length in both cords to reach the power connector on the front side of the cabinet and to reach a UPS or a dedicated 110 VAC outlet.