Table 33: Calculating Power Budget, Ac-Powered Chassis; Table 34: Calculating Power Budget, Dc Powered Chassis; Table 35: Calculating System Input Power; Table 36: Calculating System Thermal Output - Juniper SRX5400 Hardware Manual

Table 33: Calculating Power Budget, AC-Powered Chassis

Maximum Output Power of Power
Supply
1167 W (low-line)
2050 W (high-line)

Table 34: Calculating Power Budget, DC Powered Chassis

Maximum Output Power of Power
Supply
2240 W (DIP=0)
2440 W (DIP=1)

Table 35: Calculating System Input Power

Power Supply
SRX5400 AC
SRX5400 DC

Table 36: Calculating System Thermal Output

Power Supply
SRX5400 AC
SRX5400 DC
Copyright © 2017, Juniper Networks, Inc.
lists the power supplies, their maximum output power, and unused power (or a power
deficit) for an AC-powered services gateway.
Maximum Output Power for System
2333 W
(2+1 Redundancy)
4100 W
(2+1 Redundancy)
Maximum Output Power for System
2240 W x 2 = 4480 W
(2+2 Redundancy)
2240 W x 2 = 4480 W
(2+2 Redundancy)
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
power drawn by the cooling system.
Power Supply Efficiency
89 %
~98 %
1
These values are at full load and nominal voltage.
Calculate thermal output (BTUs) for the system. To calculate this value, multiply the
4.
total input power requirement (in watts) by 3.41 as shown in
Thermal Output (BTUs per hour)
2564 * 3.41 = 8743 BTU/hr
2329 * 3.41 = 7941 BTU/hr
Chapter 7: Planning and Preparing the Site
Unused Power
2333 - 2282 = 51 W
4100 - 2282 = 1818 W
Unused Power
4480 - 2282 = 2198 W
4880 - 2282 = 2598 W
Table 35 on page 97
1
Input Power Requirement
2282/0.89 = 2564 W
2282/0.98 = 2329 W
Here we include the
Table 36 on page 97.
97