Dell Networking S4048 Installation Manual page 22

Figure 10. Switch rails attachment
2 After you have installed both switch rails, line them up on the previously mounted Ready-Rails and slide the switch in until it is flush
with front of rack.
About 3 inches before you fully insert your system, the rail locking feature engages to keep the switch from inadvertently sliding out of
the rack and falling.
NOTE: Do not the use the mounted Ready-Rails as a shelf or a workplace.
22 S4048–ON installation