Cable Management Arm (Cma) And Strain Relief Bar (Srb) - Dell PowerEdge R920 Technical Manual

The adjustment range of the rails is a function of the type of rack in which they are being mounted.
The minimum/maximum values listed above represent the allowable distance between the front and
rear mounting flanges in the rack. Rail depth without the CMA or SRB 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.
For detailed information about static and sliding rails, see Additional specifications in Appendix A. For
more information on installing the R920 in a rack, see the Rack Installation Instructions on
Dell.com/Support/Manuals.
Cable Management Arm (CMA) and Strain Relief Bar (SRB)
The optional cable management arm (CMA) and strain relief bar (SRB) for the R920 organizes and
secures the cords and cables exiting the back of the server. The CMA supports up to medium size
cable loads and unfolds to allow the server to extend out of the rack without having to detach the
cables. The SRB is a bar that supports large cable loads and also allows the server to extend out of
the rack without having to detach the cables if cable service loops are created
Key features of the R920 CMA include:
Large U‐shaped baskets to support small to medium cable loads
Open vent pattern for optimal airflow
Can 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
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designs
Key features of the R920 SRB include:
Sturdy bar that supports large cable loads
Controls stresses on connectors
Power supplies are accessible without removing the SRB
Utilizes hook‐and‐loop straps rather than plastic tie wraps to make securing cables quick and
eliminates the risk of cable damage
Cables can be segregated into discrete, purpose specific bundles
Attaches to the rails without the use of tools via simple and intuitive latching design.
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Dell PowerEdge Technical Guide
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