• Two 1400-W AC power supplies
• Two 2000-W DC power supplies
• Two 2000-W HVDC power supplies
For 1+1 redundancy, you must use two power sources and connect each power supply to a separate power
source.
Note
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.
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.
Statement 1033
Connect the unit only to DC power source that complies with the Safety Extra-Low Voltage (SELV)
requirements in IEC 60950 based safety standards.
Warning
We recommend 8-AWG wire for DC installations in the U.S.
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
cold aisle and exhausts through the port end of the chassis in the hot aisle.
• Port-side intake airflow—Cool air enters the chassis through the port end in the cold aisle and exhausts
through the fan and power supply modules in the hot aisle.
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.
Cisco Nexus 93400LD-H1 NX-OS Mode Switch Hardware Installation Guide
8
Preparing the Site
Airflow Requirements
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