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Cisco MDS 9250i Multiservice Fabric Switch Hardware Installation Guide
OL-29583-01
Appendix 1 Rack Installation
Rack-Mounting Guidelines
Standard Open Rack Requirements
In addition to the requirements listed in the “General Requirements for Racks” section on page 1-1, 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 width between two front-mounting rails must be must be one RU (rack unit), equal
to 3.84 inches (9.75 cm).
• The minimum vertical rack space per chassis is one RU (rack unit), equal to 8 inches (2 cm).
Note The side rail-mount brackets provided with the Cisco MDS 9250i switch require an additional
height of 0.75 inches (1.9 cm). They are required during the installation of the Cisco MDS 9250i
switch only, and can be removed or left installed once the front-mounting brackets are securely
fastened to the mounting rails.
Requirements Specific to Two-Post Telco Rack
In addition to the requirements listed in the “General Requirements for Racks, page 1-1”, two-post telco
racks must meet the following requirements:
• The minimum width between the two mounting rails must be at least 17.75 inches (45.1 cm).
• The distance between the chassis air vents and any walls should be 2.5 inches (6.4 cm).
Rack-Mounting Guidelines
Caution If the rack is on wheels, ensure that the brakes are engaged or the rack is otherwise stabilized.
Caution If installing this kit in an EIA rack, attach the switch to all four rack-mounting rails; the EIA rails may
not be thick enough to prevent flexing of the shelf brackets if only two rails are used.
Before rack-mounting the chassis, ensure that the rack meets the following requirements:
• The specifications listed in the “Rack Requirements” section on page 1-1.
• The depth of the rack between the front-mounting and rear-mounting rails is at least 18 in. (45.7 cm)
but less than or equal to 30 in. (76.2 cm). This is specific to four-post EIA racks.
• The airflow and cooling are adequate and there is sufficient clearance around the air vents on the
switch, as described in Appendix B, “Technical Specifications.”
• The rack has sufficient vertical clearance for the chassis plus 2 RU for the shelf brackets, and any
desired clearance for the installation process.
• The rack meets the minimum rack load ratings per rack unit listed in the following table:
Rack Type MDS 9250i
EIA (4-Post) 7.5 lb (3.4 kg)
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