Juniper MX2010, Hardware Manual

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Table 72 on page 207 lists the PSMs, their maximum output power, and unused power (or a power
deficit).
Table 72: Calculating DC Power Budget
Maximum Output Power for
System (Watt)—Including
Redundant Capacity
Maximum Output Power
of Power Supply Module
(Watt) Power Supply Module
18,900 2100 MX2010 DC PSM 60 A (feed to each input)
22,500 2500 MX2010 DC PSM 80 A or DC PSM (240
V China) (feed to each input)
3. Calculate input power. Divide the total output requirement by the efficiency of the PSM as shown in
Table 73 on page 207 .
Table 73: Calculating DC Input Power
Input Power Requirement
(Watt)—per PSM
Output Power
Requirement
(Watt)—per PSM
Power Supply
Module Efficiency Power Supply Module
2307 2100 91% MX2010 DC PSM 60 A
2747 2500 91% MX2010 DC PSM 80 A or DC
PSM (240 V China)
4. Calculate thermal output (BTUs). Multiply the input power requirement (in watts) by 3.41 as shown in
Table 74 on page 207 .
Table 74: Calculating DC Thermal Output
Thermal Output (BTUs per hour) Power Distribution Module
34.5 KW divided by 0.91 * 3.41 = 129,280 BTU/hr.
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 16.5 divided by 0.91 =
37.9 KW.
MX2010 DC PDM
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