Dell PowerEdge R900 - Manual (Page 25)

Dell™ Rack Installation Guide
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5 Secure the cables to the horizontal surface of the cable tray using the
Velcro straps, then route the cables along the bend to where the cable-
management arm attaches to the cable tray, and secure the cables with
the vertical Velcro strap (see Figure 1-10).
6 Route the cables along the cable-management arm through both cable
baskets, starting with the upper basket and exiting the lower basket
(see Figure 1-10).
7 Adjust the cable slack as needed at the hinge position.
8 Use the Velcro strap that ships with your system to tightly secure
the cable bundle to the cable basket elbow.
9 Close the cable baskets.
10 Unscrew the thumbscrews that secure the front of the system to the front
vertical rail.