Dell PowerEdge Rack Enclosure 4820 - Manual (Page 10)

Cable Routing Procedures for Dell PowerEdge R720/R720xd Systems
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Section 3: Cabling a PowerEdge R720/R720xd system on sliding
rails without a CMA
NOTE: The CMA for Dell PowerEdge R720/R720xd systems is optional. Without the CMA installed, the
system must be powered down and all cables disconnected before it can be extended out of the rack.
3.1. Routing the cables
1. Connect all applicable cables to the rear of the system and verify that all connections are secure.
2. Using the hook-and-loop straps supplied with the rail kit, bundle the cables and secure them to
either the left or right outer CMA attachment bracket as described in the Rack Installation
Instructions. See Figure 9 for an example of data cables secured to the left outer CMA bracket and
power cables secured to the right outer CMA bracket (as viewed from the rear of the system).
Cable routing without a CMA Figure 9.
3.2. Removing the outer CMA brackets for shallow racks
If you are installing the system into a shallow rack (less than 1 meter deep) and you will not be
installing a CMA, the outer CMA brackets may be removed from the sliding rails if necessary in order to
allow the rails to fit properly into the rack. Remove the brackets by using a #2 Phillips screwdriver to
remove the screws that secure the brackets to the rails as shown in Figure 10. Use the hook-and-loop
straps supplied with the rail kit to secure the cables to the rack frame if desired.
Removing the outer CMA brackets for shallow racks
Figure 10.