Extreme Networks 8720 Hardware Installation Manual page 51

Installing Your Device
All installed power supplies must have the same airflow direction (front-to-back or
back-to-front) and must match the airflow direction of the installed fan modules.
Warning
To prevent an electrical hazard, make sure that the AC power cord is not
connected to the power supply before you install the power supply in the
power supply bay.
Warning
Make sure that the AC power supply circuit is not overloaded. Use proper
over-current protection, such as a circuit-breaker, to prevent over-current
conditions.
1. If necessary, remove a blank panel from the back of the switch.
2. Verify that the new power supply is right side up.
3. Verify that the new power supply's airflow direction (front-to-back or back-to-front) is
compatible with the other installed power supply (if any) and with the installed fan
modules.
Installing a 750 W Internal AC Power Supply
Extreme 8720 Switch Hardware Installation Guide 51