Page 40 - Dell PowerEdge R620 Technical Guide

The static rails (shown in Figure 11) support a wider variety of racks than the sliding rails but do not
support serviceability in the rack and are therefore are not compatible with the CMA.

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 24 lists the rack rail systems that the R620 supports. The R620 is not compatible with any
other Dell rails or CMAs including previous generation rails.

Rack Types Supported
Rail
Product Mounting Interface Rail Type 4-Post 2-Post
Identifier
Square Round Thread Flush Center
A7 ReadyRails II Sliding    X X
R620
A8 ReadyRails Static     

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, 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 a
smaller overall mounting footprint than the sliding rails.

For detailed information about static and sliding rails, see the Rack rail specifications section in
Appendix A. For more information on installing the R620 in a rack, see the Rack Installation
Instructions on Support.Dell.com/Manuals.