Dell EMC S4112-ON Series Setup Manual page 15

Figure 2. Dual-tray and rack mounting rail
3 Attach the rail to the dual tray. Slide the rail back until it locks into place.
4 Repeat with the other side.
Figure 3. Attach the dual-tray and rack mounting rails
5 Install the dual tray inside the four-post rack. Rack mount screws are not included.
6 Attach the front dual-tray switch rails to the four-post rack from the front. Secure the
dual tray to the rack using two user-supplied screws for each rack post.
S4112-ON Series Installation 15