Dell Precision 7920 Rack Owner's Manual page 91

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the CMA represents the minimum depth of the rail with the outer CMA brackets removed (if applicable) as measured from the
front mounting flanges of the rack.
Cable management arm (CMA)
The optional cable management arm (CMA) organizes and secures the cords and cables exiting the back of the systems. It
unfolds to allow the systems to extend out of the rack without having to detach the cables. Some key features of the CMA
include:
● Large U-shaped baskets to support dense cable loads
● Open vent pattern for optimal airflow
● Ability to be mounted on either side by simply swinging the spring-loaded brackets from one side to the other
● Utilizes hook-and-loop straps rather than plastic tie wraps to eliminate the risk of cable damage during cycling
● Includes a low-profile fixed tray to both support and retain the CMA in its fully closed position
● Both the CMA and the tray mount without the use of tools via simple and intuitive snap-in designs
The CMA can be mounted to either side of the sliding rails without the use of tools or the need for conversion. However, it is
recommended that it be mounted on the side opposite to the power supplies to allow easier access to the power supplies and
rear hard drives (if applicable) for service or replacement.
Rack Installation
NOTE:
The 2U system requires two people for installation due to its heavier weight.
Installing the system into the rack (option A: Drop-In)
The sliding rails are a "drop-in" design. This means that the system is installed vertically into the rails by inserting the standoffs
on the sides of the system into the "J-slots" in the inner rail members with the rails in the fully extended position. As with all 2U
systems, a minimum of two people are required in order to properly install the system in the rails.
1. Pull the inner rails out of the rack until they lock into place.
Disassembly and reassembly
91

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