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Power Requirements for DC-Powered SRX3600 Services Gateways

 Note

If you plan to operate a maximally configured DC-powered services gateway, we recommend that you provision 45 A @ -48 VDC for the system.

If you do not plan to provision 45 A @ -48 VDC for the system, you can use the information in Table 1 and Table 2 to calculate the power consumption @ -48 VDC, and thermal output for various hardware configurations.

Table 1 lists the power requirements for base DC-powered services gateways operating under typical voltage conditions.

Table 1: DC-Powered Base System Requirements

DC Power Supply Configuration

Power Requirement (Watts)

Nonredundant configuration includes two DC power supplies, midplane, SFB, Routing Engine, and fan tray

375 W (approximate)

Redundant configuration includes four DC power supplies, midplane, SFB, Routing Engine, and fan tray

430 W (approximate)

Note

The power requirement values shown in Table 1 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 375 W to the overall system power requirement.

Table 2 lists the power requirements for various hardware components when the services gateway is operating under typical voltage conditions.

Table 2: Component DC Power Requirements

Component

Power Requirement (Watts)

48V Input Power Requirement at 80% Power Supply Efficiency

Routing Engine

53 W

66 W

SPC

118 W

148 W

NPC

64 W

80 W

SCM

35 W

44 W

NP-IOC

52 W

65 W

IOC (max)

40 W

50 W

IOC (min)

52 W

65 W

Use the information in Table 1 and Table 2 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 DC-powered services gateways:

  • Minimum DC-powered configuration:

  • Maximum DC-powered configuration:

  • Input current from a DC source other than -48 VDC (based on maximum configuration; applies to DC power supply only):

  • Thermal output for maximally configured DC-powered services gateway: