Juniper QFabric QFX3000-G Hardware Documentation page 339

Power Consumption of Different QFX3008-I Interconnect Device Configurations
System Thermal Output for Different QFX3008-I Interconnect Device Configurations
Copyright © 2018, Juniper Networks, Inc.
To calculate the maximum system power consumption for a QFX3008-I Interconnect
device with one 16-port QSFP+ front card installed:
Add the individual power requirements of all components in the chassis configuration.
See "Power Requirements for a QFX3008-I Interconnect Device" on page
Thus, power consumption = Power requirements of: (Chassis) + 1 (16-port QSFP+
front card)
= 4500 W + 240 W
= 4740 W
To calculate the maximum system power consumption for a QFX3008-I Interconnect
device with eight 16-port QSFP+ front cards installed:
Add the individual power requirements of all components in the chassis configuration.
See "Power Requirements for a QFX3008-I Interconnect Device" on page
Thus, power consumption = Power requirements of: (Chassis) + 8 (16-port QSFP+
front card)
= 4500 W + 8 (240 W)
= 4500 W + 1920 W
= 6420 W
To calculate the system thermal output in British thermal units (BTU) per hour for your
device configuration, multiply the maximum system power consumption of the switch
by 3.41.
To calculate the system thermal output for a fully loaded QFX3008-I Interconnect device:
Compute the maximum system power consumption of a fully loaded configuration.
1.
See maximum system power consumption for a fully loaded configuration device in
"Power Consumption of Different QFX3008-I Interconnect Device Configurations" on
page 289.
Multiply the maximum system power consumption by 3.41
2.
= 6420 W x 3.41
System thermal output for a fully loaded switch configuration = 21,892 BTU/hr
NOTE: Using the maximum system power consumption values to calculate
the system thermal output often results in overprovisioning the cooling
systems. Typical power consumption is about one-third lower than these
calculated values.
Chapter 14: Planning QFX3008-I Power Requirements
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