Dell EMC Unity Series Field Upgrade Procedure page 29

Securing cables to the cable management arms
a. Swing the B-side cable management arm to the right side of the enclosure,
and align the short retention latch with the upper rail bracket.
b. Press the short retention latch onto the upper rail bracket.
c. Make sure that you hear the audible click that indicates that the B-side cable
management arm is in place.
Figure 27 Closing the cable management arms
Perform this procedure to secure the cables to the cable management arms.
Procedure
1. Lift the latches on each cable holder on the cable management arm.
2. Insert the cables in the cable holders along the arm.
3. Snap shut the latches on the cable holders.
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Securing cables to the cable management arms
Adding an optional 80-drive DAE
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