HP J3245A Installation And Configuration Manual page 24

Installation
3. Mount the Switch
3.
Figure 1-7. Attach the Mounting Brackets
4.
1-10
Using a Phillips cross-head screwdriver, attach the L-shaped mounting
brackets to each side of the switch with four 10-mm M4 screws (included
in the accessory kit).
Align Top of
Bracket with
Top of Switch
10-mm M4
Screws
Place the switch in the rack and lower it so the notches in the bottom of
the bracket slide onto the screws you installed in step 1. Tighten these
screws—be careful not to overtighten. (Refer to figures 1-8 and 1-10.)