Table 28: Calculating Power Budget, Ac-Powered Chassis; Table 29: Calculating Power Budget, Dc Powered Chassis; Table 30: Calculating System Input Power; Table 31: Calculating System Thermal Output - Juniper SRX5400 Hardware Manual

Table 28: Calculating Power Budget, AC-Powered Chassis

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

Table 29: Calculating Power Budget, DC Powered Chassis

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

Table 30: Calculating System Input Power

Power Supply
SRX5400 AC
SRX5400 DC

Table 31: Calculating System Thermal Output

Power Supply
SRX5400 AC
Copyright © 2017, Juniper Networks, Inc.
Table 28 on page 95 lists the power supplies, their maximum output power, and
unused power (or a power deficit) for an AC-powered services gateway.
Table 29 on page 95 lists the power supplies, their maximum output power, and
unused power (or a power deficit) for a DC-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)
2440 W x 2 = 4880 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)
2354 * 3.41 = 8027 BTU/hr
Chapter 7: Planning and Preparing the Site
Unused Power
2333 - 2095 = 238W
4100 - 2095 = 2005W
Unused Power
4480 - 2020 = 2460 W
4880 - 2020 = 2860 W
Table 30 on page 95
1
Input Power Requirement
2095/0.89 = 2354 W
2095/0.98 = 2138 W
Here we include the
Table 31 on page 95.
95