Table 35: Airflow Direction In Power Supplies For Ex4300 Switches - Juniper QFabric QFX3000-G Hardware Documentation

QFX3000-G QFabric System Hardware Documentation
Power Supplies

Table 35: Airflow Direction in Power Supplies for EX4300 Switches

Power Supply Rating Label on Power Supply
350 W AC
AIR IN (AFI)
350 W AC AIR OUT (AFO)
550 W DC
AIR IN (AFI)
550 W DC
AIR OUT (AFO)
715 W AC AIR OUT (AFO)
1100 W AC
AIR OUT (AFO)
148
EX4300 switches except EX4300-48MP and EX4300-48MP-S switches support AC or
DC power supplies with different airflow directions. EX4300-48MP and EX4300-48MP-S
switches support only AC power supplies with front-to-back airflow. Power supplies for
the EX4300 switch are fully redundant, load-sharing, and hot-removable and
hot-insertable FRUs. All the EX4300 switch models except EX4300-24T-S,
EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, EX4300-48P-S, and EX4300-48MP-S
switches are shipped with one power supply preinstalled in the rear panel of the switches.
EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, EX4300-48P-S, and
EX4300-48MP-S switches are not shipped with preinstalled power supplies; you must
order the power supplies separately.
Each power supply has a label—
power supply that indicates the direction of airflow.
back-to-front airflow while
Table 35 on page 148 lists the AC and DC power supplies used in EX4300 switches and
the direction of airflow in them.
AIR IN (AFI) or AIR OUT (AFO)
AIR IN (AFI)
labels indicate front-to-back airflow.
AIR OUT (AFO)
Direction of Airflow
Back-to-front—that is, air intake to cool the
chassis is through the vents on the rear panel of
the chassis and hot air exhausts through the vents
on the front panel of the chassis.
Front-to-back—that is, air intake to cool the
chassis is through the vents on the front panel of
the chassis and hot air exhausts through the vents
on the rear panel of the chassis.
Back-to-front—that is, air intake to cool the
chassis is through the vents on the rear panel of
the chassis and hot air exhausts through the vents
on the front panel of the chassis.
Front-to-back—that is, air intake to cool the
chassis is through the vents on the front panel of
the chassis and hot air exhausts through the vents
on the rear panel of the chassis.
Front-to-back—that is, air intake to cool the
chassis is through the vents on the front panel of
the chassis and hot air exhausts through the vents
on the rear panel of the chassis.
Front-to-back—that is, air intake to cool the
chassis is through the vents on the front panel of
the chassis and hot air exhausts through the vents
on the rear panel of the chassis.
—on the faceplate of the
labels indicate
Copyright © 2018, Juniper Networks, Inc.