Table 8: Airflow Direction in Power Supplies for EX4300 Switches (continued)
Direction of AirflowLabel on Power SupplyPower Supply Rating
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
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)1100 W AC
For more information, see “Cooling System and Airflow in an EX4300 Switch” on page 43.
CAUTION: Do not mix:
•
AC and DC power supplies in the same chassis.
•
Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT
(AFO)) in the same chassis.
•
Fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO))
in the same chassis.
•
Power supplies and fan modules with different airflow labels (AIR IN (AFI)
and AIR OUT (AFO)) in the same chassis.
Fan Modules
In the EX4300 switches the fan modules are hot-insertable and hot-removable
field-replaceable units (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 two fan modules
preinstalled in the rear panel of the switch. EX4300-24T-S, EX4300-24P-S,
EX4300-32F-S, EX4300-48T-S, and EX4300-48P-S switches are not shipped with
preinstalled fan modules; you must order the fan modules separately.
The fan modules are available in two models that have different airflow
directions—back-to-front airflow, indicated by the label AIR IN (AFI) and front-to-back
airflow, indicated by the label AIR OUT (AFO). See “Cooling System and Airflow in an
EX4300 Switch” on page 43.
CAUTION: Do not mix:
Copyright © 2017, Juniper Networks, Inc.12
EX4300 Switch Hardware Guide
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