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NOTE: The power requirement values shown in Table 33 on page 189 are for
a lightly loaded system. For a heavily loaded system, the contribution of the
base system to the overall system power requirement is lower, because the
power supply efficiency improves as the load increases. For a heavily loaded
system, both the redundant and nonredundant base systems contribute
approximately 271 W to the overall system power requirement.
Table 34 on page 190 lists the power requirements for various hardware components
when the services gateway is operating under typical voltage conditions.
Table 34: Component AC Power Requirements
AC Input Power Requirement at
85% Power Supply Efficiency Power Requirement
(Watts)
Component
62 W 53 W Routing Engine
139 W 118 W SPC
75 W 64 W NPC
41 W 35 W SCM
61 W 52 W NP-IOC
47 W 40 W IOC (min)
61 W 52 W IOC (max)
Use the information in Table 33 on page 189 and Table 34 on page 190 to calculate power
consumption for various hardware configurations, input current from a different source
voltage, and thermal output, as shown in the following examples. These examples use
maximum values per IOC.
Typical power consumption for AC-powered services gateways:
• Minimum AC-powered configuration:
Base services gateway (nonredundant) + 1 SPC + 1 NPC =
271 W + 139 W + 75 W = 485 W
• Maximum AC-powered configuration:
Base services gateway (redundant) + 4 SPCs + 2 NPC + 1 IOC (max) + 1 SCM =
271 W + 4(139) W + 2(75) W + 61 W + 41 W =
271 W + 556 W + 150 W + 61 W + 41 W = 1079 W
• Typical system thermal output (based on maximally configured AC-powered services
gateway @ 110 V input):
Watts * 3.41 = BTU/hr
1079 W * 3.41 = 3679 BTU/hr
Copyright © 2013, Juniper Networks, Inc. 190
SRX3400 Services Gateway Hardware Guide