Table 36: Details of the DC Power Supplies in EX4300 Switches
(continued)
550 W DC Power Supply
Details
Install in power supply slots labeled
PSU 0
and
PSU 1
in the rear panel of
the chassis.
Power supply slots
Internal
Fans
•
Front-to-back, indicated by label
AIR OUT (AFO)
•
Back-to-front, indicated by label
AIR IN (AFI)
Airflow
IN OK
and
OUT OK
Power supply status LEDs
4 A
DC input current rating
–38 through –60 VDC
NOTE:
The minimum input power required to power on the switch is
–43.5 +/– 0.5 VDC. After the switch is powered on, the operating range is
–38 through –60 VDC.
Operating range
To prevent electrical injury while installing or removing DC power supplies, carefully follow
instructions in
“Installing a DC Power Supply in an EX4300 Switch” on page 224
and
“Removing a DC Power Supply from an EX4300 Switch” on page 226
.
DC Power Supply Airflow
Each power supply has its own fan and is cooled by its own internal cooling system.
Each power supply has a label
AIR OUT (AFO)
or
AIR IN (AFI)
on the faceplate of the
power supply that indicates the direction of airflow in the power supply.
Table 37 on page 57
lists the DC power supply models and the direction of airflow in
them.
Table 37: Airflow Direction in DC Power Supply Models for EX4300 Switches
Direction of Airflow
Label on Power Supply
Model
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)
JPSU-550-DC-AFO-A
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)
JPSU-550-DC-AFI-A
N+0 Redundancy Configuration of DC Power Supplies
In an
N
+0 redundancy configuration, no power is reserved for resiliency regardless of
number of power supplies installed in the switch.
57
Copyright © 2015, Juniper Networks, Inc.
Chapter 4: Power Supplies
Summary of Contents for EX4300
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