Power Supplies; Table 8: Airflow Direction In Power Supplies For Ex4300 Switches - Juniper EX4300 Hardware Manual

Power Supplies

Table 8: 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)
Copyright © 2017, Juniper Networks, Inc.
For 32-port EX4300 switches:
QSFP+ ports (built-in) or QSFP+ uplink module ports configured as VCPs
SFP+ uplink module ports configured as VCPs
NOTE: The four built-in SFP+ ports on 32-port EX4300 switches cannot
be configured as VCPs.
By default, the built-in QSFP+ ports are configured as VCPs.
EX4300 switches support AC or DC power supplies with different airflow directions.
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, and EX4300-48P-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, and EX4300-48P-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 8 on page 11 lists the AC and DC power supplies used in EX4300 switches and
the direction of airflow in them.
or
AIR IN (AFI) AIR OUT (AFO)
AIR IN (AFI)
AIR OUT (AFO) labels indicate front-to-back airflow.
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.
Chapter 1: System Overview
—on the faceplate of the
labels indicate
11