•
Standard 19-inch (48.3 cm) (four-post EIA cabinet or rack, with mounting rails that conform to English
universal hole spacing per section 1 of ANSI/EIA-310-D-1992). For more information, see
Specific to Perforated Cabinets, on page 42
.
•
The minimum vertical rack space requirement per chassis is 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.
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 one rack unit (RU), equal to 1.75 inches (4.4 cm).
•
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
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.
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 9332PQ NX-OS-Mode Switch Hardware Installation Guide
42
Rack Specifications
Requirements Specific to Standard Open Racks
