CAUTION: Do not mix:
•
AC and DC power supplies in the same chassis.
•
Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
•
Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR
OUT (AFO)) in the same chassis.
CAUTION: Verify that the airflow direction on the power supply handle matches the
direction of airflow in the chassis. Ensure that each power supply you install in the chassis
has the same airflow direction. If you install power supplies with two different airflow
directions, Junos OS raises an alarm. If you need to convert the airflow pattern on a
chassis, you must replace all the fans and power supplies at one time to use the new
direction.
Table 14 on page 52 lists the AC and DC power supplies used in QFX5120 switches and the direction of
airflow in them.
Table 14: Airflow Direction in Power Supplies for QFX5120 Switches
Color of Power Supply HandleDirection of AirflowProduct Number
Juniper GoldFront to backJPSU-650W-AC-AO
Juniper Azure BlueBack to frontJPSU-650W-AC-AI
AC Power Supply Specifications for QFX5120 Switches
QFX5120 switches support 650 W AC power supplies.
The tables in this topic provides power supply specification of AC power supplies used in an QFX5120
switch:
Table 15 on page 52 shows the power supply specifications for QFX5120-32C switches.
Table 15: Power Supply Specifications for QFX5120-32C Switches
Operating range: 100 VAC to 240 VACAC input voltage
52
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