Juniper QFX5120 Series, Hardware Manual

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Table 20: Details of the DC Power Supplies in QFX5120 Switches
650 W DC Power Supply Details
•
JPSU-650-DC-AFO
•
JPSU-650-DC-AFI
Model number
Hot-insertable and hot-removable Field-replaceable unit (FRU) type
2.43 lb (1.1 kg) Power supply weight
1 Minimum installed in chassis
2 Maximum installed in chassis
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 “Connecting DC Power to a QFX5120 Switch” on page 101 and “Maintaining the QFX5120 Power System”
on page 124
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 21 on page 60 lists the DC power supply models and the direction of airflow in them.
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