Rack Rails And Cable Management; Readyrails Ii Mounting Interface - Dell PowerEdge R920 Technical Manual

9 Rack rails and cable management

The sliding rail system for the R920 provides tool‐less support for 4‐post racks with square or
unthreaded round mounting holes, including all generations of Dell racks. The sliding rail system
also supports tooled mounting in 4‐post threaded racks.
In contrast to the R910 sliding rails that required the use of adapter brackets, the sliding rails for the
R920 now offer native support for threaded‐hole racks via the new ReadyRails II mounting interface.
The rails ship in the tool‐less mounting configuration but can be converted to the tooled
configuration very quickly and easily as shown in the figure below.
The optional cable management arm (CMA) or strain relief bar (SRB) that is provided with the CMA
can be mounted to the sliding rails without the use of tools for fast and easy deployment. The CMA
can be mounted on either the left or right side of the sliding rails.
NOTE: The R920 is not compatible with any other Dell rails or SRBs, including previous generation
rails and SRBs. The R920 is compatible with R820, R720, R720xd and R520 CMAs.
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Dell PowerEdge Technical Guide
Figure 6. ReadyRails II mounting interface