General Requirements for Cabinets and Racks
The cabinet or rack must meet the following requirements:
• The minimum vertical rack space per Cisco UCS 6454 fabric interconnect must be one RU (rack unit),
equal to 1.75 in. (4.4 cm).
• Standard 19 in. (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.
• The width between the rack-mounting rails must be at least 17.72 in. (45.0 cm) if the rear of the fabric
interconnect is not attached to the rack. For four-post EIA racks, this is the distance between the two
front rails.
• For four-post EIA cabinets (perforated):
• 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 in. (7.6 cm), and a minimum of 5
in. (12.7 cm) if cable management brackets are installed on the front of the fabric interconnect.
• The distance between the outside face of the front mounting rail and the outside face of the back
mounting rail should be 23.5 to 34.0 in. (59.7 to 86.4 cm) to allow for rear-bracket installation.
• A minimum of 2.5 in. (6.4 cm) of clear space should exist between the side edge of the fabric
interconnect and the side wall of the cabinet. No sizeable flow obstructions should be immediately
in the way of fabric interconnect air intake or exhaust vents.
Requirements Specific to Perforated Cabinets
A perforated cabinet is defined here 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, on page 16, 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 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 racks meet or exceed all these requirements.
Unpacking and Inspecting the Cisco UCS Fabric Interconnect
When handling fabric interconnect components, wear an ESD strap and handle modules by the carrier edges
only. A grounding lug mounting point is provided on the fabric interconnect. For the grounding lug to be
effective, the fabric interconnect must be grounded through the power cable, the chassis ground, or the
metal-to-metal contact with a grounded rack.
Caution
Cisco UCS 6400 Series Fabric Interconnect Hardware Installation Guide
16
Installing the Cisco UCS Fabric Interconnect
General Requirements for Cabinets and Racks
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