Juniper EX4600, Hardware Manual

Page: 42 / 230

The power supply provides FRU-to-port or 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 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, 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
Handle
Direction of Airflow Product Number
Juniper Azure Blue FRU-to-port JPSU-650W-AC-AFI
QFXC01-PWRACI-650A
Juniper Gold Port-to-FRU JPSU-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