Reference Guide

44 PowerEdge R720 and R720xd Technical Guide
The static rails (shown in Figure 15) support a wider variety of racks than the sliding rails, but do not
support serviceability in the rack and are not compatible with the CMA.
Figure 15. Static rails
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 23 lists the rack rail systems that the R720 and R720xd support.
Table 23. Supported rack rail system
System
Rail
identifier
Mounting interface
Rail
type
Rack types supported
4-post
2-post
Square
Round
Thread
Flush
Center
R720/R720xd
B6
ReadyRails II
Sliding



X
X
B4
ReadyRails
Static





For detailed information about rail dimensions, see the
Rack rail specifications section in Appendix A. For more information on installing the T620 in a rack,
see the Rack Installation Instructions on Dell.com/Support/Manuals.