Thepower supply providesFRU-to-portor port-to-FRU airflow depending on the product
SKU you purchase. On legacy switches, or switches with an LCD, this airflow is called
back-to-front and front-to-back. The power supplies either have labels on the handles
that indicate the direction of airflow or they have color-coded handles with a fan icon.
See Figure 12 on page 24 for an example of the power supply. Either a power supply has
the label AFI or a blue handle, which denotes FRU-to-port airflow. A power supply with
the label AFO or a gold-colored handle denotes port-to-FRU airflow.
Figure 12: Power Supply Handle Detail
1— Fan icon on handle
CAUTION: Verify that the airflow direction on the power supply handle
matches the direction of airflow in the chassis. Ensure that each powersupply
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, and
the fault ALM LED blinks amber. If you need to convert the airflow pattern on
a chassis, you must change out all the fans and power supplies at one time
to use the new direction.
Table 10 on page 24 shows the different power supplies and their direction of airflow.
Table 10: Airflow Direction in EX4600 and QFX5100 AC Power Supplies
Color of Power Supply
HandleDirection of AirflowProduct Number
Juniper Azure BlueFRU-to-portJPSU-650W-AC-AFI
QFXC01-PWRACI-650A
Juniper GoldPort-to-FRUJPSU-650W-AC-AFO
To avoid electrical injury, carefully follow instructions in “Connecting AC Power to an
EX4600 Switch” on page 147.
Related
Documentation
AC Power Cord Specifications for an EX4600 Switch on page 79•
• AC Power Supply LEDs on an EX4600 Switch on page 194
Copyright © 2014, Juniper Networks, Inc.24
EX4600 Switch Hardware Guide
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