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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 inches (4.4 cm).
• The minimum vertical rack space per chassis must be one RU (rack unit), equal to 1.75 inches (4.4
cm).
• The width between the rack-mounting 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 distance 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 outside face of the front mounting rail and the outside face of the back
mounting rail should be 23.0 to 30.0 inches (58.4 to 76.2 cm) to allow for rear-bracket installation.
• 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 should be immediately in the way of
chassis air intake or exhaust vents.
Note Optional jumper power cords are 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 following 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 open area per rack unit of door height.
• The roof should be perforated with at least a 20 percent open area.
• The cabinet floor should be open or perforated to enhance cooling.
The Cisco R Series rack conforms to these requirements.
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 you are mounting the chassis in an open rack (no side panels or doors), ensure that the rack
meets the following requirements:
• The minimum vertical rack space per chassis must be two rack units (RU), equal to 3.47 inches (8.8
cm).
• The horizontal distance between the chassis and any adjacent chassis should be 6 inches (15.2 cm),
and the distance between the chassis air vents and any walls should be 2.5 inches (6.4 cm).