DC Power Supply for a QFX3500, QFX3600, or QFX3600-I Device
The power supplies in a QFX3500, QFX3600, and QFX3600-I device (see Figure 1 and Figure 2) are hot-removable and hot-insertable field-replaceable units (FRUs) that you can install in the device without powering off the device or disrupting the switching function.
The DC power supply in QFX3500, QFX3600, and QFX3600-I devices is 650 W.
Shunt positive input terminals
ESD grounding point
Shunt negative input terminals
The V+ terminals are shunted internally together, as are the V- terminals. The same polarity terminal can be wired together from the same source to provide an additional current path in a higher power chassis. Do not connect the terminals to different sources.
To supply sufficient power, terminate the DC input wiring on a facility DC source that is capable of supplying a minimum of 7 A at –48 VDC for QFX3500 and 8 A a5 –48 VDC for QFX3600..
The power supply provides FRU-to-port or port-to-FRU airflow
depending on the SKU you purchase. The power supplies have labels
and arrows on the handles that depict the direction of airflow (see Figure 3). The label
AFI denotes FRU-to-port airflow.
AFO denotes port-to FRU airflow.
Airflow in indicator
Verify that the airflow direction of the power supply
handle matches the direction of airflow in the chassis. Ensure that
each power supply you install in the chassis has the same airflow
direction. If you install power supplies with two different airflow
directions, Junos OS raises an alarm, and the status (
OK/!) LED blinks amber.
Table 1 shows the different power supplies and their direction of airflow.
Table 1: Airflow Direction in QFX3500, QFX3600, and QFX3600-I Device DC Power Supplies
Direction of Airflow
To avoid electrical injury, carefully follow instructions in Connecting DC Power to a QFX3500, QFX3600, or QFX3600-I Device.