Airflow Requirements; Rack And Cabinet Requirements - Cisco Nexus 9336PQ Hardware Installation Manual

Aci-mode switch

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Airflow Requirements

The switch is positioned with its ports in either the front or the rear of the rack depending on your cabling

and maintenance requirements. You must have fan and power supply modules that move the coolant air from

the cold aisle to the hot aisle in one of the following ways:

• Port-side exhaust airflow—Coolant air enters the chassis through the fan and power supply modules in

• Port-side intake airflow—Coolant air enters the chassis through the port end in the cold aisle and exhausts

• Dual-direction airflow—The direction of the installed fan modules determines the airflow.

You can identify the airflow direction of each fan and power supply module by its coloring as follows:

• Blue coloring indicates port-side exhaust airflow.

• Burgundy coloring indicates port-side intake airflow.

• White coloring on HVAC/HVDC power supplies indicates dual direction airflow.

• Gray coloring on DC power supplies indicates port-side exhaust airflow.

• Green coloring on DC power supplies indicates port-side intake airflow.

Note

To prevent the switch from overheating and shutting down, you must position the air intake for the switch in

a cold aisle. The fan and power supply modules must have the same direction of airflow (even if their coloring

is different). If you must change the airflow direction for the switch, you must shutdown the switch before

changing the modules.

You can install the following types of racks or cabinets for your switch:

• Standard perforated cabinets

• Solid-walled cabinets with a roof fan tray (bottom-to-top cooling)

• Standard open four-post Telco racks

Work with your cabinet vendors to determine which of their cabinets meet the following requirements or see

the Cisco Technical Assistance Center (TAC) for recommendations:

• Use a standard 19-inch (48.3-cm), four-post Electronic Industries Alliance (EIA) cabinet or rack with

• The depth of a four-post rack must be 24 to 32 inches (61.0 to 81.3 cm) between the front and rear

Cisco Nexus 9336PQ ACI-Mode Switch Hardware Installation Guide

the cold aisle and exhausts through the port end of the chassis in the hot aisle.

through the fan and power supply modules in the hot aisle.

mounting rails that conform to English universal hole spacing per section 1 of the ANSI/EIA-310-D-1992

standard.

mounting rails (for proper mounting of the bottom-support brackets or other mounting hardware).

Preparing the Site

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