Calculating Ac Power Requirements For Mx2020 Routers; Table 61: Calculating Ac Power Budget - Juniper MX2020 Hardware Manual

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Calculating AC Power Requirements for MX2020 Routers

Copyright © 2013, Juniper Networks, Inc.
Appendix D: Power Guidelines, Requirements, and Specifications for the MX2020 Router
MX2020 Power Subsystem Description on page 39
Connecting AC Power to a MX2020 Router with Three-Phase Delta AC Power
Distribution Modules on page 117
Connecting AC Power to a MX2020 Router with Three-Phase Wye AC Power Distribution
Modules on page 122
MX2020 AC Power Subsystem Electrical Specifications on page 369
MX2020 AC Power Cord Specifications on page 370
The information in this topic helps you determine which of the two input ratings for the
PSM is suitable for various configurations. You determine suitability by subtracting the
total power draw from the maximum output of the PSM. Afterward, you calculate the
required input current. Finally, you calculate the thermal output.
We recommend that you provision power according to the maximum input current listed
in the power subsystem electrical specifications.
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.
To calculate the AC power requirements:
Calculate the power (usage) using the values, (see
1.
on page 373).
Evaluate the power budget, including the budget for each configuration if applicable,
2.
and check the required power against the maximum output power of available PDM
options.
Table 61 on page 377 lists the three-phase delta and wye feed requirements, maximum
input and output power per PSM, and power efficiency.

Table 61: Calculating AC Power Budget

Power Distribution Maximum Input
Module Power per PSM
Three-phase delta AC 2800W
PDM (4 per
system)—50A feed
(input #1), and 25A
feed (input #2)
"MX2020 AC Power Requirements"
Maximum Output Power Supply Module
Power per PSM Efficiency
2500W 91%
377