Cable Management Arm (Cma); Table 24. Rail Information; Figure 30. Rail Adjustability - Dell External OEMR R310 Technical Manual

Dell
Rail
Identifier
A3
A4
1
Requires the 1U Threaded Rack Adapter Brackets Kit (Dell PN 8Y19G).
Note that screws are not included in the static rail kit due to the fact that threaded racks are offered with a
variety of thread designations. Users must therefore provide their own screws when mounting the static
rails in threaded or 2-post racks.
Other key factors governing proper rail selection 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. Due to their reduced complexity and lack of
need for CMA support, the static rails offer a greater adjustability range and an overall smaller footprint
than the sliding rails.
Note that the adjustment range of the rails is a function of the type of rack in which they are being
mounted. The min-max values listed above represent the allowable distance between the front and rear
mounting flanges in the rack. Rail depth represents the minimum depth of the rail as measured from the
rack front mounting flanges when the rail rear bracket is positioned all the way forward.
15.3

Cable Management Arm (CMA)

The optional cable management arm (CMA) for the R310 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 R310 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
Dell PowerEdge R310 Technical Guide
Table 24.
Mounting
Interface
ReadyRails™
ReadyRails™/Generic

Figure 30. Rail Adjustability

Rail Adjustability Range (mm)
Rail
Identifier
Square Round
Min Max Min
A3 686 883 672
A4 608 879 594
Rail Information
Rack Types Supported
Rail
4-Post
Type
Square Round
√ √
Sliding
Static √ √
Threaded
Max Min Max
876 651 897
872 604 890
2-Post
Thread Flush Center
1
√ X X
√ √ √
Rail Depth
(mm)
without with
CMA CMA
714 835
622 -
66