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Figure 27: DC Power Supply for an EX4550 Switch
g050210
2
3
1
AFI
3—
1—
Ejector lever
Handle
2—Terminal block
The DC power supply in EX4550 switches is a hot-insertable and hot-removable
field-replaceable unit (FRU): You can install it without powering off the switch or
disrupting the switching function.
Two variants of DC power supplies are available, each with a different airflow:
•
Back-to-front airflow, indicated by
AFI
label
•
Front-to-back airflow, indicated by
AFO
label
Each power supply has a label
AFI
or
AFO
and an arrow on the handle that depicts the
direction of airflow (see
Figure 28 on page 46
).
Table 22 on page 45
shows the DC power supply model numbers and the direction of
airflow in them.
Table 22: Airflow Direction in DC Power Supply Used in EX4550 Switches
Direction of Airflow
Label on Power Supply
Model Number
Back-to-front—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.
AFI
JPSU-650W-DC-AFI
Front-to-back—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.
AFO
JPSU-650W-DC-AFO
45
Copyright © 2015, Juniper Networks, Inc.
Chapter 4: Power Supplies
Summary of Contents for EX4550
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