Figure 15: AC Power Supply in QFX5110 Switches
3—1— AC appliance inletHandle
4—2— Security latchPower cord retainer
Thepowersupplyprovides FRU-to-port or port-to-FRU airflowdepending 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 16 on page 34 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 16: Power Supply Handle Detail
1— Fan icon on handle
CAUTION: Verify that the airflow direction on the power supply handle
matches the direction of airflowin 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 change out
all the fans and power supplies at one time to use the new direction.
Table 14 on page 35 shows the different power supplies and their direction of airflow.
Copyright © 2017, Juniper Networks, Inc.34
QFX5110 Switch Hardware Guide
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