For four-post EIA cabinets (perforated or solid-walled):
• The distance between the front door and front mounting posts should be a minimum of 3 in. (7.6 cm) to
allow for the bend radius of FC port fibre-optic patch cables.
• The distance between the outside face of the front mounting post and the outside face of the back mounting
post should be 26 to 32 in. (66 to 81 cm) to allow for installation with the Cisco rack mounting kit.
• The distance between the rear of the chassis and the perforated rear door of the cabinet (required for
airflow in the cabinet, if used) should be a minimum of 3.0 in. (7.6 cm).
• No clearance is required between the chassis and the sides of the rack or cabinet (no side airflow).
• The amount of clearance required for interface cables is 3 in. (7.6 cm) minimum and module handles is
1 in. (25 mm) minimum.
Requirements Specific to Perforated Cabinets
In addition to the requirements listed in the
General Requirements for Cabinets and Racks
section, perforated
cabinets with front-to-back airflow 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
sq. in. (96.7 sq cm) of open area per rack unit of door height.
• We recommend that the roof be perforated with at least 20 percent open area.
• We recommend an open or perforated cabinet floor to enhance cooling but it is not required.
Reference Perforated Cabinet
A perforated cabinet that conforms to the above requirements is available from Rittal Corporation:
Rittal Corporation
One Rittal Place
Springfield, OH 45504
Phone: (800) 477-4000
Cabinet P/N: Rittal 9969427
Cabinet description: PS-DK/OEM Cabinet Assembly, 1998 x 600 x 1000 (H x W x D)
(42U)
Requirements Specific to Solid-Walled Cabinets
In addition to the requirements listed in the
General Requirements for Cabinets and Racks
section, solid-walled
cabinets must meet the following requirements:
• A roof-mounted fan tray and an air-cooling scheme in which the fan tray pulls air in at the bottom of the
cabinet and sends it out from the top, with a minimum airflow of 849.5 m
3
/h exiting the cabinet roof
through the fan tray, to be available.
• Nonperforated (solid and sealed) front and back doors and side panels to be present so that air travels
predictably from bottom to top.
• The overall cabinet depth to be 36 to 42 in. (91.4 to 106.7 cm) to allow the doors to close and to facilitate
adequate airflow.
Cisco MDS 9148V-K9 Switch Hardware Installation Guide
14
Cabinet and Rack Installation
Requirements Specific to Perforated Cabinets