Cable Management Arm (Cma); Rack View; Rail Adjustability Range And Depth - Dell External OEMR R910 Technical Manual

Dell
*Adapter brackets are available from RackSolutions that allow the R910 sliding rails to mount in threaded
racks. The only option available for 2-post racks is to mount the system on a fixed shelf.
Other factors to consider when deploying the R910 include the spacing between the front and rear
mounting flanges of the rack, the type and location of any equipment mounted in the back of the
rack such as power distribution units (PDUs), and the overall depth of the rack. For example, use of
the CMA requires racks that are a minimum of 1m in depth with the PDUs or other rack accessories
positioned on the sides or rear of the rack away from the CMA.
NOTE: The min-max values listed above represent the allowable distance between the front and rear
mounting flanges in the rack. Rail depth without the CMA represents the minimum depth of the rail
with the outer CMA brackets removed (as measured from the front mounting flanges of the rack).

16.3 Cable Management Arm (CMA)

The optional cable management arm (CMA) for the R910 organizes and secures the cords and cables
exiting the back of the server and unfolds to allow the server to extend out of the rack without
having to detach the cables. Some key features of the R910 CMA include:

Large U-shaped baskets to support dense cable loads

Open vent pattern for optimal airflow

Fully reversible (can be mounted on either side) with no conversion required

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

16.4 Rack View

The R910 ReadyRails sliding rails are a ―drop-in‖ design, meaning that the system is installed
vertically into the rails by inserting the shoulder nuts on the sides of the system into the J-slots in
the inner rail members with the rails in the fully extended position.
Dell PowerEdge R910 Technical Guide

Rail Adjustability Range and Depth

Table 15.
Rail Adjustability Range (mm)
Square Round
Min Max Min Max
686 883 672 876
Rail Depth
(mm)
Threaded
without with
CMA CMA
Min Max
- - 755 883
58