AC Power Supply for a QFX3500, QFX3600, or QFX3600-I Device
The power supplies in QFX3500, QFX3600, and QFX3600-I devices (see Figure 1) are hot-removable and hot-insertable field-replaceable units (FRUs) that you can install on the front panel without powering off the device or disrupting the switching function.
The AC power supply in QFX3500, QFX3600, and QFX3600-I devices is 650 W.
The power supply provides FRU-to-port or port-to-FRU airflow depending on the product SKU you purchase. On legacy switches, or switches with an LCD, this airflow is called back-to-front and front-to-back. The power supplies either have labels on the handles that indicate the direction of the airflow or they have color-coded handles with a fan icon. See Figure 3 for an example of the power supply with the fan icon. A power supply with a blue handle denotes FRU-to-port airflow; a power supply with a gold-colored handle denotes port-to-FRU airflow.
Verify that the direction of the airflow on 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: Airfow Direction in QFX3500, QFX3600, or QFX3600-I AC Power Supplies
Direction of Airflow
To avoid electrical injury, carefully follow instructions in Connecting AC Power to a QFX3500, QFX3600, or QFX3600-I Device.