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A-2
Cisco Nexus 3000 Series Hardware Installation Guide
OL-25338-04
Appendix A Cabinet and Rack Specifications
Cabinet and Rack Requirements
The cabinet or rack must also meet the following requirements:
• The minimum vertical rack space per Cisco Nexus 3000 Series switch chassis must be one RU (rack
units), equal to 1.75 inch es (4.4 cm).
• The minimum vertical rack space per chass is must be one RU (rack unit), equal to 1.75 inches ( 4.4
cm).
• The width between the rack-mounti ng rails must be at least 17.75 inches (45.0 cm) if the rear of the
device is not attached to the rack. For four-post EIA racks, this measurement is the di stance between
the two front rails.
Four-post EIA cabinets (perforated or solid-walled) must meet the following requirements:
• The minimum spacing for the bend radius for fiber-optic cables should have the front-mounting rails
of the cabinet offset from the front door by a minimum of 3 inches (7.6 cm).
• The distance between the outsid e face of the front mounting rail a nd the outside face of the back
mounting rail shoul d be 23.0 to 30.0 inche s (58.4 to 76.2 cm) to allow for rear-bracket in stallation.
• A minimum of 2.5 inches (6.4 cm) of clear space should exist between the side edge of the chassis
and the side wall of the cabinet. No sizeable flow obstructions shou ld be immediately in the way of
chassis air intake or exhaust vents.
Note Optional jumper power cords a re available for use in a cabinet. See the “Jumper Power Cord ”
section on page C-8.
Requirements Specific to Perforated Cabinets
A perforated cabinet has perforations in its front and rear doors and side walls. In addition to the
requirements listed in the “General Requirements for Cabinets and Racks” section on page A-1, perforated
cabinets must meet the followin g requirements:
• The front and rear doors must have at least a 60 percent open area perforation pattern, with at least
15 square inches (96 .8 square cm) of o pen area per rack un it of door height.
• The roof should be perforated wi th at least a 20 percent open area .
• The cabinet floor should be open or perforated to enhance cooling
The Cisco R Series rack conform s to these requirements.
Requirements Specific to Standard Open Racks
In addition to the require ments listed in the “General Requirements for Cabinets and Racks” section on
page A-1, if you are mounting the chassis in an open rack (no side panels or doors), ensure that the rack
meets the following re quirements:
• The minimum vertical rack space per chassis mu st be two rack units (RU), equal to 3.47 inches (8.8
cm).
• The horizontal distance between the chassis and any adjacent chassis sho uld be 6 inches (15.2 cm),
and the distance between the ch assis air vents and any walls shou ld be 2.5 inches (6.4 cm).