10 Four-Post Rack InstallationInstallation TasksInstalling a rack kit involves performing the following tasks (described in detail in subsequent sections)in their numbered order:1 Removing the rack doors2 Marking the rack3 Configuring the sliding rail assemblies (sliding rail kits only)4 Installing chassis static rail modules (static rail kits only)5 Installing the mounting rails in the rack6 Installing the system in the rack7 Installing the tray and cable-management arm (sliding rail kits only)8 Routing cables9 Replacing the rack doorsRemoving the Rack DoorsSee the procedures for removing doors in the documentation provided with your rack cabinet.CAUTION: Because of the size and weight of the rack cabinet doors, never attempt to remove or install themby yourself.CAUTION: Store the two doors where they will not injure someone if the doors accidently fall over.Marking the RackFor a 1-U system, you must allow 1 U (44 mm, or 1.75 inches) of vertical space for each system you installin the rack.Rack cabinets that meet EIA-310 standards have an alternating pattern of three holes per rack unit withcenter-to-center hole spacing (beginning at the top hole of a 1-U space) of 15.9 mm, 15.9 mm, and 12.7 mm(0.625 inch, 0.625 inch, and 0.5 inch) for the front and back vertical rails (see Figure 1-3). Rack cabinets mayhave round or square holes.NOTE: The vertical rails may be marked by horizontal lines and numbers in 1-U increments. If you want, you canmake a note of the number marking on the rack’s vertical rail. It is not necessary to mark or place tape on the rack.
