A-2
Cisco Nexus 2000 Series Hardware Installation Guide
OL-19013-05
AppendixA Cabinet and Rack Installation
Cabinet and Rack Requirements
The cabinet or rack must also meet the following requirements:
•The minimum vertical rack space per Cisco Nexus 2000 Series FEX 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.
•For four-post EIA cabinets (perforated or solid-walled), the requirements are as follows:
–
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 3inches (7.6 cm).
–
The distance between the outside face o f the front mounting rail and the o utside 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.
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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 th e cabinet. No sizeable flow obstru ctions should be immediately
in the way of chassis air in take or exhaust vents.
Note Optional jumper power cords a re available for use in a cabinet. See the “Jumper Power Cord ”
section on pageC-8.
Requirements Specific to Perforated Cabinets
A perforated cabinet is defined as a cabinet with perforated front and rear doors and solid side walls. In
addition to the requirements listed in the “General Requirements for Cabinets and Racks” section on
pageA-1, pe rforated cabinets must meet the following requirements:
•The front and rear doors must have at least a 60 percent open area per foration pattern with at least
15 square inches (96.774 square cm) of open area per rack unit 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
pageA-1, if 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 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).