Correct Connector Locations; Mounting The Rails To The Connectors - Dell EMC ML3 User Manual

Figure 39. Correct connector locations
c. Repeat step b on the right and left rack posts in the rear of the rack.
d. Mount the LH Rackmount rail to the connectors. See Figure 40.
e. Repeat step d with the RH Rackmount Rail.
Figure 40. Mounting the rails to the connectors
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Dell EMC ML3 Tape Library: User's Guide