Table 70: Calculating Dc Power Budget; Table 71: Calculating Dc Input Power; Table 72: Calculating Dc Thermal Output - Juniper MX2020 Hardware Manual

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Copyright © 2015, Juniper Networks, Inc.
Table 70 on page 183 lists the PSMs, their maximum output power, and unused power
(or a power deficit).

Table 70: Calculating DC Power Budget

Power Supply Module
MX2020 DC PSM 60 A (feed to
each input)
MX2020 DC PSM 80 A (feed to
each input)
Calculate input power. Divide the total output requirement by the efficiency of the
3.
PSM as shown in Table 71 on page

Table 71: Calculating DC Input Power

Power Supply Module
MX2020 DC PSM 60 A
MX2020 DC PSM 80 A
Calculate thermal output (BTUs). Multiply the input power requirement (in watts) by
4.
3.41 as shown in Table 72 on page

Table 72: Calculating DC Thermal Output

Power Distribution Module
MX2020 DC PDM
MX2020 Power Subsystem Description on page 83
Overview of Preparing the Site for the MX2020 Router on page 103
MX2020 DC Power Distribution Description on page 177
MX2020 DC Power Subsystem Electrical Specifications on page 179
Chapter 14: DC Power Requirements, Specifications, and Guidelines
Maximum Output Power
of Power Supply Module
(Watt)
2100
2500
183.
Output Power
Power Supply Requirement
Module (Watt)—per
Efficiency PSM
91% 2100
91% 2500
183.
Thermal Output (BTUs per hour)
34.5 KW divided by 0.91 * 3.41 = 129,280 BTU/hr
(Zone 0 output. The calculation method for Zone 1
is the same as for Zone 0).
34.5 KW of output power consumed by the chassis.
This is the maximum output the chassis can
consume in a redundant configuration. The input
power is 34.5 divided by 0.91 = 37.9 KW.
Maximum Output Power for
System (Watt)—including
redundant capacity
37,800
45,000
Input Power
Requirement
(Watt)—per PSM
2307
2747
183