lists the power supplies, their maximum output power, and
unused power (or a power deficit) for an AC-powered services gateway.
lists the power supplies, their maximum output power, and
unused power (or a power deficit) for a DC-powered services gateway.
Table 28: Calculating Power Budget, AC-Powered Chassis
Unused Power
Maximum Output Power for System
Maximum Output Power of Power
Supply
2333 - 2095 = 238W
2333 W
(2+1 Redundancy)
1167 W (low-line)
4100 - 2095 = 2005W
4100 W
(2+1 Redundancy)
2050 W (high-line)
Table 29: Calculating Power Budget, DC Powered Chassis
Unused Power
Maximum Output Power for System
Maximum Output Power of Power
Supply
4480 - 2020 = 2460 W
2240 W x 2 = 4480 W
(2+2 Redundancy)
2240 W (DIP=0)
4880 - 2020 = 2860 W
2440 W x 2 = 4880 W
(2+2 Redundancy)
2440 W (DIP=1)
3.
Calculate input power. In this step, the input power requirements for the example
configuration are calculated. To do this, divide the total output requirement by the
efficiency of the power supply as shown in
Here we include the
power drawn by the cooling system.
Table 30: Calculating System Input Power
Input Power Requirement
Power Supply Efficiency
1
Power Supply
2095/0.89 = 2354 W
89 %
SRX5400 AC
2095/0.98 = 2138 W
~98 %
SRX5400 DC
1
These values are at full load and nominal voltage.
4.
Calculate thermal output (BTUs) for the system. To calculate this value, multiply the
total input power requirement (in watts) by 3.41 as shown in
Table 31: Calculating System Thermal Output
Thermal Output (BTUs per hour)
Power Supply
2354 * 3.41 = 8027 BTU/hr
SRX5400 AC
95
Copyright © 2017, Juniper Networks, Inc.
Chapter 7: Planning and Preparing the Site
Summary of Contents for SRX5400
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