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Installing a Power Supply in a QFX5100 Device

The QFX5100 is shipped from the factory with two power supplies. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed and running. You can install replacement power supplies in the two slots next to the fan modules without powering off the switch or disrupting the switching function.

To install a power supply in a QFX5100 device (see Figure 1 and Figure 2):

  1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Taking care not to touch power supply components, pins, leads, or solder connections, remove the power supply from its bag.

    Verify that the direction of the arrow 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 (ALM) LED blinks amber.

  3. Using both hands, place the power supply in the power supply slot on the FRU panel of the switch and slide it in until it is fully seated and the locking lever slides into place.
Figure 1: Installing a Power Supply in a 1 U QFX5100 DeviceInstalling a Power Supply in a 1 U QFX5100 Device
Figure 2: Installing a Power Supply in a QFX5100-96S DeviceInstalling a Power Supply in a QFX5100-96S Device

Each power supply must be connected to a dedicated power source outlet.


If you have a Juniper Care service contract, register any addition, change, or upgrade of hardware components at . Failure to do so can result in significant delays if you need replacement parts. This note does not apply if you replace existing components with the same type of component.