Table 51: Calculating Dc Power Budget; Table 52: Calculating Dc Input Power; Table 53: Calculating Dc Thermal Output - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
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368
Table 51 on page 368 lists the PSMs, their maximum output power, and unused power
(or a power deficit).

Table 51: 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 52 on page

Table 52: 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 53 on page

Table 53: Calculating DC Thermal Output

Power Distribution Module
MX2020 DC PDM
MX2020 Power Subsystem Description on page 39
MX2020 Site Preparation Checklist on page 67
MX2020 DC Power Distribution on page 359
MX2020 DC Power Subsystem Electrical Specifications on page 357
Maximum Output Power
of Power Supply Module
(Watt)
2100
2500
368.
Output Power
Power Supply Requirement
Module (Watt)—per
Efficiency PSM
91% 2100
91% 2500
368.
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
Copyright © 2013, Juniper Networks, Inc.