H3C Technologies H3C S7500E Series Switches - Manual (Page 15)

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1. Calculate the total power consumption
The total power consumption of an S7500E series switch depends on card type and quantity and
fan tray power consumption. If the switch provides PoE power, the total power consumption also
depends on PoE power consumption. For more information about the total power consumption of
the S7500E series, see "Appendix A Chassis views and technical specifications."
2. Select power modules according to the total power consumption
To ensure correct operation of the switch, make sure the maximum output power of the power
module that supplies power to the switch is higher than the total power consumption of the switch.
After determining the total power consumption of the switch, you can select appropriate power
modules according to the total power consumption. For more information about the optional
power module models, see "Appendix B FRUs and compatibility matrixes."
3. Verify that the power supply system on the installation site satisfies the input requirements of the
power modules and parameters such as rated voltage.
Cooling
For adequate heat dissipation, plan the installation site according to the airflow of your switch, and
adhere to the following requirements:
• Leave a clearance of a minimum of 10 cm (3.94 in) around the air inlet and outlet vents.
• The rack for installing the switch has a good cooling system.
• The installation site has a good cooling system.