Rack Rails; Cable Management Arm (Cma) And Strain Relief Bar (Srb) - Dell PowerEdge R940 Technical Manual

The rail offerings consist of sliding rails only.
The sliding rails allow the system to be fully extended out of the rack for service. There is also an optional Cable Management Arm (CMA)
and optional Strain Relief Bar (SRB).
Figure 7. Sliding rails with optional CMA and optional SRB
One key factor in selecting the proper rails is identifying the type of rack in which they will be installed. Both the sliding rails and the static
rails support tool-less mounting in 19"-wide, EIA-310-E-compliant square hole and unthreaded round hole 4-post racks. Both also support
tooled mounting in threaded hole 4-post racks, but only the static rails, as the more universal solution, support mounting in 2-post (Telco)
racks.
Table 15. Sliding rail
Product Rail Rail type
identifier
R940 B12 Sliding
NOTE: Screws are not included in either 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 rails in threaded racks.
NOTE: Screw head diameter for the sliding rails must be 10 mm or less.
Cable Management Arm (CMA) and Strain Relief Bar
(SRB)
The optional cable management arm (CMA) and Strain Relief Bar (SRB) 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
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Rack Rails

Mounting Rail adjustability range (mm)
interface
Square Round
min max min
ReadyRails II 600 894 586
Min rail mounting depth (mm)
Threaded
max min max Without CMA
or SRB
887 600 909 773
9
Rack Rails
With With SRB
CMA
926 877