Juniper EX4100 Hardware Manual page 89

To prevent electrical injury while installing or removing DC power supplies, carefully follow instructions
in "Install a DC Power Supply in an EX4100 Switch" on page 187
an EX4100 Switch" on page
Specifications of the DC Power Supplies Used in EX4100 Switches
Table 23 on page 80 provides the power supply specifications of the 150 W DC power supplies.
Table 23: Specifications of the 150 W DC Power Supplies Used in EX4100 Switches
Item
DC input voltage
DC input current rating
Output power
DC Power Supply Airflow
Each power supply has its own fan and internal cooling system. Each power supply has a label AIR OUT
or AIR IN on the faceplate of the power supply that indicates the direction of airflow through the power
supply. Table 24 on page 80
throughthem.
Table 24: Airflow Direction in DC Power Supply Models for EX4100 Switches
Model
JPSU-150-DC-AFO
188.
Specification
Rated operating voltage: –48 VDC to –60 VDC
4.7A - 2.8 A
150 W
lists the DC power supply models and the direction of airflow
Label on Power Supply
AIR OUT
and "Remove a DC Power Supply from
Direction of Airflow
Front to back: Air to cool the chassis
enters through the vents on the
front panel of the chassis. Hot air
exits through the vents on the rear
panel of the chassis.
80