Juniper Networks MX480 - Manual (Page 309)

APPENDIX D
Power Guidelines, Requirements, and
Specifications for the MX480 Router
• Calculating Power Requirements for MX480 Routers on page 285
• Power Requirements for an MX480 Router on page 289
• MX480 Chassis Grounding Specifications on page 294
• MX480 AC Power Specifications and Requirements on page 297
• MX480 DC Power Specifications and Requirements on page 301
• Site Electrical Wiring Guidelines for MX Series Routers on page 305
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 30 on page 287 .
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 page 297 and “DC Power Supply Electrical Specifications for the MX480
Router” on page 301 ).
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.
285 Copyright © 2013, Juniper Networks, Inc.