Table 82: Calculating Power Budget; Table 83: Calculating Input Power Examples - Juniper MX240 Hardware Manual

Table 82: Calculating Power Budget

Power Supply
MX240 AC Normal-capacity (low-line)
MX240 AC Normal-capacity (high-line)
MX240 AC High-capacity (low-line)
MX240 AC High-capacity (high-line)
MX240 DC Normal-capacity
MX240 DC High-capacity (DIP=0)
MX240 DC High-capacity (DIP=1)

Table 83: Calculating Input Power Examples

Power Supply
MX240 AC Normal-capacity (high-line)
MX240 AC High-capacity (high-line)
MX240 DC Normal-capacity
MX240 DC High-capacity
Copyright © 2017, Juniper Networks, Inc.
Table 73 on page 139 lists the power supplies, their maximum output power, and unused
power (or a power deficit). See
MX240 Router" on page 143
MX240 Router" on page 127
electrical specifications.
1
For this configuration, output power excluding the cooling system is 1400 W.
Calculate input power. In this step, the input power requirements for the example
3.
configuration are calculated. To do this, divide the total output requirement by the
efficiency of the power supply as shown in
1
These values are at full load and nominal voltage.
2
For this configuration, total power is 1485 W.
Calculate thermal output (BTUs). To calculate this, multiply the input power
4.
requirement (in watts) by 3.41. See
Chapter 13: DC Power Requirements and Specifications
"DC Power Supply Electrical Specifications for the
and "AC Power Supply Electrical Specifications for the
for more information about the MX240 power supply
Maximum System Output
Power
2054 W
1590 W
2334 W
2050 W
1600 W
2400 W
2600 W
Table 74 on page
1
Power Supply Efficiency
85 %
89 %
~98 %
~98 %
Table 75 on page
1
Unused Power
654 W
190 W
934 W
650 W
200 W
1000 W
1200 W
139.
2
Input Power Requirement
1747 W
1669 W
1515 W
1515 W
140.
155