The type of racks and cabinets to mount your switch.
Install these types of racks or cabinets for your switch:
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Standard perforated cabinets
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Solid-walled cabinets with a roof fan tray (bottom-to-top cooling)
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Standard open four-post Telco racks
Work with your cabinet vendors to determine which of their cabinets meet these requirements or see the Cisco Technical Assistance Center (TAC) for recommendations:
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Use a standard 19-inch (48.3-cm), four-post Electronic Industries Alliance (EIA) cabinet or rack with mounting rails that conform to English universal hole spacing per section 1 of the ANSI/EIA-310-D-1992 standard.
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The depth of a four-post rack must be 24 to 32 inches (61.0 to 81.3 cm) between the front and rear mounting rails (for proper mounting of the bottom-support brackets or other mounting hardware).
You must also have power receptacles that are located within reach of the power cords that are used with the switch.