Juniper QFX5120 Series Hardware Manual page 43

Table 12: Airflow Direction in QFX5120 Switch Models (continued)
Model Number
QFX5120-48Y-DC-AFO2
QFX5120-48Y-DC-AFI2
CAUTION:
AC and DC power supplies in the same chassis.
Fan modules and power supplies with different airflow directions in the same chassis.
Power supplies and fan modules with different airflow labels (AIR IN and AIR OUT) in
the same chassis.
QFX5120 Models with Front-to-Back Airflow
In the QFX5120 switch models that have front-to-back airflow, the air intake to cool the chassis is through
the vents on the front panel of the switch and hot air exhausts through the vents on the rear panel.
Fan Modules and Color of the Fan
Power Supply Module
The switch ships Juniper Gold
with five fan
modules and two
DC power supplies,
each with a label
AIR OUT.
The switch ships Juniper Azure Blue
with five fan
modules and two
DC power supplies,
each with a label
AIR IN.
Do not mix:
Direction of
Airflow in the Fan
Module Power Supplies
Front-to-back—air For switches that
intake to cool the have fan modules
chassis is through with the AIR OUT
the vents on the label, you must
front panel of the install only power
chassis, and hot air supplies that have
exhausts through the AIR OUT label.
the vents on the
rear panel of the
chassis.
Back-to-front—air For switches that
intake to cool the have fan modules
chassis is through with the AIR IN
the vents on the label, you must
rear panel of the install only power
chassis, and hot air supplies that have
exhausts through the AIR IN label.
the vents on the
front panel of the
chassis.
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