Figure 59: 2 U Ac Power Supply In A Qfx5100-96S Switch; Figure 60: Power Supply Handle Detail - Juniper QFabric QFX3000-G Hardware Documentation

Copyright © 2018, Juniper Networks, Inc.

Figure 59: 2 U AC Power Supply in a QFX5100-96S Switch

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 have color-coded handles with a
fan icon. See Figure 60 on page 95
with a blue handle denotes FRU-to-port airflow; a power supply with a gold-colored
handle denotes port-to-FRU airflow.

Figure 60: 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. 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 15 on page 96 shows the different power supplies and their direction of airflow.
for an example of the power supply. A power supply
Chapter 4: QFX5100 Overview
95