Power Consumption for a DC-Powered SRX5600 Services Gateway

Note: If you plan to operate a maximally configured DC-powered services gateway, we recommend that you provision 58 A  (32 A per feed) @ –48 VDC for the system.

If you do not plan to provision 58 A  (32 A per feed) @ –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 devices operating under typical voltage conditions.

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

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 generalized values per IOC. Typical power consumption for DC-powered devices:

• Minimum DC-powered configuration:
  Base device (nonredundant) + 1 SCB + 1 Routing Engine + 1 IOC—Generalized typical value + 1 SPC—Generalized typical value =2.8 A + 3.1 A + 1.9 A + 6.5 A +4.4 A = 18.7 A @ –48 VDC =898 W
• Maximum DC-powered configuration:
  Base device (redundant) + fan tray at full speed + 2 SCBs + 1 Routing Engine + 5 IOCs—Generalized maximum value + 1 SPC—Generalized maximum value =3.8 A + 0.6 A + 2(3.1) A + 1.9 A + 5(7.6 A) + 7.3 A= 3.8 A + 0.6 A + 6.2 A + 1.9 A + 38 A + 7.3 A= 57.8 A @ –48 VDC = 2774 W DC
• Input current from a DC source other than –48 VDC (based on maximum configuration; applies to DC power supply only):
  (–54 VDC input) * (input current X) = (–48 VDC input) * (input current Y)54 * X = 48 * 57.8 AX = (48 * 57.8 A)/54 = 51.4 A
• Thermal output for maximally configured DC-powered services gateway:
  Watts DC * 3.41= BTU/hr2774 W * 3.41 = 9459 BTU/hr