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A-3
Cisco MDS 9200 Series Hardware Installation Guide
OL-17468-02
Appendix A Cabinet and Rack Installation
Cabinet and Rack Requirements
Requirements Specific to Solid-Walled Cabinets
A solid-walled cabinet is defined here as a cabinet with solid front and rear doors and solid side walls.
In addition to the requirements listed in the “General Requirements for Cabinets and Racks” section on
page A-1, solid-walled cabinets must meet the following requirements:
• A roof-mounted fan tray and an air cooling scheme in which the fan tray pulls air in at the bottom
of the cabinet and exhausts it out the top, with a minimum of 500 cfm of airflow exiting the cabinet
roof through the fan tray.
• Nonperforated (solid and sealed) front and back doors and side panels so that air travels predictably
from bottom to top.
• A recommended cabinet depth of 36 to 42 in.(91.4 to 106.7 cm) to allow the doors to close and for
adequate airflow.
• A minimum of 150 sq. in. (968 sq. cm) of open area at the floor air intake of the cabinet.
• The lowest piece of equipment should be installed a minimum of 1.75 in. (4.4 cm) above the floor
openings to prevent blocking the floor intake.
Requirements Specific to Standard Open Racks
In addition to the requirements listed in the “General Requirements for Cabinets and Racks” section on
page A-1, if mounting the chassis in an open rack (no side panels or doors), ensure that the rack meets
the following requirements:
• The minimum width between two front mounting rails must be 17.75 in. (45.1 cm).
• The minimum vertical rack space per chassis must be three RU (rack unit), equal to 5.25 in. (13.3
cm).
• The distance between the outside face of the front mounting rail and the outside face of the back
mounting rail should be 23.5 to 34.0 in. (59.7 to 86.4 cm) to allow for rear bracket installation.
• The horizontal distance between the chassis and any adjacent chassis should be 6 in.(15.2 cm), and
the distance between the chassis air vents and any walls should be 2.5 in. (6.4 cm).
Requirements Specific to telco Racks
In addition to the requirements listed in the “General Requirements for Cabinets and Racks” section on
page A-1, telco racks should meet the following requirements:
• The width of the rack between the two rack-mounting rails should be at least 17.75 in. (45.1 cm).
• The distance between the chassis air vents and any walls should be 2.5 in. (6.4 cm).