Appendix D Power Guidelines, Requirements, And Specifications For The Mx480; Router; Calculating Power Requirements For Mx480 Routers - Juniper MX480 Hardware Manual

APPENDIX D
Power Guidelines, Requirements, and
Specifications for the MX480 Router

Calculating Power Requirements for MX480 Routers

Copyright © 2011, Juniper Networks, Inc.
Calculating Power Requirements for MX480 Routers on page 269
MX480 Chassis Grounding Specifications on page 273
MX480 AC Power Specifications and Requirements on page 275
MX480 DC Power Specifications and Requirements on page 280
Site Electrical Wiring Guidelines for MX Series Routers on page 283
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 27 on page 271.
We recommend that you provision power according to the maximum input current listed
in the power supply electrical specifications (see
MX480 Router" on page 276and
Router" on page 280).
Use the following procedures to calculate the power requirement:
Calculate the power requirement.
1.
Evaluate the power budget.
2.
Calculate input power.
3.
Calculate thermal output (BTUs) for cooling requirements.
4.
"AC Electrical Specifications for the
"DC Power Supply Electrical Specifications for the MX480
269