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.

Note

The V+ terminals are referred to as +RTN and V– terminals are referred to as –48 V in DC Power Wiring Sequence Warning and DC Power Electrical Safety Guidelines.

Figure 1: DC Power Supply for a QFX3500, QFX3600, or QFX3600-I Device
DC Power Supply for
a QFX3500, QFX3600, or QFX3600-I Device
  1
Handle
  3
Ejector lever
  2
Terminal block
 
Figure 2: DC Power Supply Faceplate
DC Power Supply
Faceplate
  1
Shunt positive input terminals
  5
ESD grounding point
  2
Shunt negative input terminals
  6
Fault LED
  3
Terminal block
  7
Output LED
  4
Ejector lever
  8
Input LED
Caution

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.

Figure 3: Label Identifying Airflow Direction on Power Supply Handle
Label Identifying
Airflow Direction on Power Supply Handle
  1
Airflow in indicator
 
Caution

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

Model

Direction of Airflow

JPSU-650W-DC-AFI

FRU-to-port

JPSU-650W-DC-AFO

Port-to-FRU

To avoid electrical injury, carefully follow instructions in Connecting DC Power to a QFX3500, QFX3600, or QFX3600-I Device.