Juniper EX4300, Hardware Manual

Page: 33 / 342

•
For 32-port EX4300 switches:
• QSFP+ ports (built-in) or QSFP+ uplink module ports configured as VCPs
• SFP+ uplink module ports configured as VCPs
By default, the built-in QSFP+ ports are configured as VCPs.
Power Supplies
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 pre-installed 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 pre-installed power supplies; you must order them
separately.
Each power supply has a label—
AIR IN (AFI)
or
AIR OUT (AFO)
—on the faceplate of the
power supply that indicates the direction of airflow.
AIR IN (AFI)
labels indicate
back-to-front airflow while
AIR OUT (AFO)
labels indicate front-to-back airflow.
Table 8 on page 11 lists the AC and DC power supplies used in EX4300 switches and
the direction of airflow in them.
Table 8: Airflow Direction in Power Supply for EX4300 Switches
Direction of Airflow Label on Power Supply Power Supply Rating
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.
AIR IN (AFI)
350 W AC
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.
AIR OUT (AFO)
350 W AC
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.
AIR IN (AFI)
550 W DC
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. AIR OUT (AFO) 550 W DC
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. AIR OUT (AFO) 715 W AC
11 Copyright © 2015, Juniper Networks, Inc.
Chapter 1: System Overview