Calculating Power Requirements for MX480 Routers
The information in this topic helps you determine which power supplies are suitable for
various configurations, as well as which power supplies are not suitable because output
power is exceeded. You determine suitability by subtracting the total power draw from
the maximum output of the power supplies. Afterward, the required input power is
calculated. Finally, you calculate the thermal output. A sample configuration is provided
in Table 81 on page 151.
We recommend that you provision power according to the maximum input current listed
in the power supply electrical specifications (see “AC Electrical Specifications for the
MX480 Router” on page139and “DC PowerSupplyElectrical Specifications for the MX480
Router” on page 157).
Use the following procedures to calculate the power requirement:
1. Calculate the power requirement.
2. Evaluate the power budget.
3. Calculate input power.
4. Calculate thermal output (BTUs) for cooling requirements.
167Copyright © 2017, Juniper Networks, Inc.
Chapter 13: DC Power Requirements, Specifications, and Guidelines
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