Airflow Requirements - Cisco Nexus 9364C-H1 Hardware Installation Manual

Airflow Requirements

The power supplies are rated to output up to 1400 W (AC power supplies), or up to 2000 W (DC power
supplies), but the switch requires less than those amounts of power from the power supply. To operate the
switch, you must provision enough power from the power source to cover the requirements of both the switch
and a power supply. Typically, this switch and a power supply require 605 W of power input from the power
source, but you must provision as much as 1100 W power input from the power source to cover peak demand.
Note
To minimize the possibility of circuit failure, make sure that each power-source circuit that is used by the
switch is dedicated to the switch.
Warning
Note
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.
To identify the airflow options for your switch, see the user-replaceable components in the Overview section
of this document.
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—Cool air enters the chassis through the fan and power supply modules in the
• Port-side intake airflow—Cool air enters the chassis through the port end in the cold aisle and exhausts
• Single-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.
• Red coloring indicates port-side intake airflow.
• Red coloring on DC power supplies indicates port-side intake airflow.
Cisco Nexus 9364C-H1 NX-OS Mode Switch Hardware Installation Guide
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Some of the power supply modules have rating capabilities that exceed the switch requirements. When
calculating your power requirements, use the switch requirements to determine the amount of power that is
required for the power supplies.
Statement 1033 Safety Extra-Low Voltage (SELV)—IEC 60950/ES1–IEC 62368 DC Power Supply
To reduce the risk of electric shock, connect the unit to a DC power source that complies with the SELV
requirements in IEC 60950-based safety standards or ES1 and PS1 requirements in IEC 62368-based safety
standards or to a Class 2 power supply.
We recommend 8-AWG wire for DC installations in the U.S.
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.
Preparing the Site