Power Consumption for an AC-Powered SRX5800 Services Gateway
We recommend that you provision 11 A @ 240 VAC
for each input.
If you do not plan to provision 11 A @ 240 VAC
for each input, you can use the information in Table 1 and Table 2 to calculate the power
consumption and thermal output for your hardware configuration.
Table 1 lists the power
requirements for base AC-powered services gateways operating under
typical voltage conditions and includes nonredundant and redundant
power supply configurations.
Table 1: Base Device AC Power Requirements
AC Power Supply Configuration
|
Power Requirement (Watts)
|
Nonredundant AC configuration includes
three AC power supplies, the midplane, craft interface, and fan trays
(running at normal speed)
|
471 W (approximate)
|
Redundant AC configuration includes four AC
power supplies, the midplane, craft interface, and fan trays (running
at normal speed)
|
500 W (approximate)
|
Table 2 lists the
power requirements for various hardware components under typical voltage
conditions.
Table 2: Component Power Requirements for AC-Powered Devices
Component
|
Power Requirement (Watts)
|
Power Requirement (Watts) with 85% Efficiency
|
Cooling system (full speed – normal speed)
|
600 W – 400 W = 200 W
|
235 W
|
SCB
|
150 W
|
176 W
|
Routing Engine
|
90 W
|
106 W
|
IOC—Generalized typical value
|
312 W
|
367 W
|
IOC—Generalized maximum value
|
365 W
|
429 W
|
SPC—Generalized typical value
|
213 W
|
251 W
|
SPC—Generalized maximum value
|
351 W
|
413 W
|
Typical power consumption for AC-powered
devices:
- Power consumption for minimum
configuration:
- Base device and three power supplies + 2 SCBs + 1 Routing
Engine + 1 IOC + 1 SPC—Generalized typical value=
- 471 W + (2)176 W + 106 W + 367 W + 251
= 1547 W
- AC Power consumption for maximum configuration:
- Base device and four power supplies + fan tray at full
speed + 2 SCBs + 1 Routing Engine + 10 IOCs + 1 SPC—Generalized
maximum value=
- 500 W + 235 W + 2(176 W) + 106 W + 10(429 W)+ 413
W = 500 W + 235 W + 352 W + 106 W + 4290 W+ 413 W = 5896
W
- Current requirement adjustment for fans running at full
speed (high temperature environment or cooling component failure):
- Calculated system current (X) – Cooling (normal)
+ Cooling (full speed) =
- X A – 8.3 A + 12.5 A =
- X A + 4.2 A
- System thermal output for maximally configured AC-powered
services gateway:
- Watts DC* 3.41 = BTU/hr
- 5896 W * 3.41 = 20,105 BTU/hr
Published: 2009-11-03
