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Requirements Specific to Standard Open Racks
• The minimum vertical rack space requirement per chassis is:
• The width between the rack-mounting rails must be at least 17.75 inches (45.0 cm) if the rear of the
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 distance between the outside face of the front mounting rail and the outside face of the back mounting
Requirements Specific to Standard Open Racks
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 three rack units (RUs), equal to 5.25 inches (13.3
• The distance between the chassis air vents and any walls should be 2.5 inches (6.4 cm).
Requirements Specific to Perforated Cabinets
A perforated cabinet has perforations in its front and rear doors and side walls. 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
• 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.
Cable Management Guidelines
To help with cable management, you might want to allow additional space in the rack above and below the
chassis to make it easier to route all of the fiber optic or copper cables through the rack.
Cisco Nexus 93128TX ACI-Mode Switch Hardware Installation Guide
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• For a one RU (rack unit) switch, 1.75 inches (4.4 cm)
• For a one and a half RU (rack unit) switch, 2.63 (6.68 cm)
• For a two RU (rack unit) switch, 3.5 inches (8.8 cm)
• For a three RU (rack unit) switch, 5.25 inches (13.3 cm)
device is not attached to the rack. For four-post EIA racks, this measurement is the distance between the
two front rails.
the cabinet offset from the front door by a minimum of 3 inches (7.6 cm).
rail should be 23.0 to 30.0 inches (58.4 to 76.2 cm) to allow for rear-bracket installation.
cm).
square inches (96.8 square cm) of open area per rack unit of door height.
Rack Specifications
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