Juniper QFX3500, Техническая документация, Страница: 210 / 669

Table 64 on page 186 lists the details of the 550 W DC power supplies used in EX4300 switches.
Table 64: Details of the DC Power Supplies in EX4300 Switches
550 W DC Power Supply Details
•
JPSU-550-DC-AFO-A
•
JPSU-550-DC-AFI-A
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 “Installing a DC Power Supply in an EX4300 Switch” on page 467 and Removing an AC Power Supply from
an EX4300 Switch.
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.
186