Install Internal Power Supplies

If your device does not come with an installed internal power supply, you can install one or two power supplies. All installed power supplies must blow air in the same direction (front-to-back or back-to-front) and must match the airflow direction of the installed fan modules.

If the power supply has a red tab, the airflow is front-to-back. Use a power supply labeled Air Out.
If the power supply has a blue tab, the airflow is back-to-front. Use a power supply labeled Air In.

The following 550 W internal AC power supplies (PSUs) are available for the switch:

Part number XN-ACPWR-550W-FB-A provides front-to-back airflow for cooling and 550 W AC power.
Part number XN-ACPWR-550W-BF-A provides back-to-front airflow for cooling and 550 W AC power.

For installation instructions, see Replace Internal Power Supplies.