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Tools and Parts Required for Installation


To mount a QFX5120 switch on a rack, you need:

  • Two front-mounting brackets and twelve screws to secure the brackets to the chassis —provided

  • Two rear-mounting brackets —provided

  • Screws to secure the chassis to the rack —not provided

  • Phillips (+) screwdriver, number 2 —not provided

  • Electrostatic discharge (ESD) grounding strap —not provided

To connect the QFX5120-48Y switch to earth ground, you need:

  • A grounding cable (minimum 12 AWG (2.5 mm²), minimum 90° C wire, or as permitted by the local code), a grounding lug (Panduit LCD10-10A-L or equivalent), a pair of 10-32 x .25- in. screws with #10 split-lock washers, and a pair of #10 flat washers —not provided

To connect the QFX5120-32C switch to earth ground, you need:

  • A grounding cable (minimum 14 AWG (1.5mm²), minimum 90° wire, or as permitted by the local code), a grounding lug (4.3 mm circular lug), and one 8 mm screw —not provided

To connect power to the switch, you need:

  • For all the AC-powered models (QFX5120-48Y-AFO, QFX5120-48Y-AFI, QFX5120-32C-AFO, and QFX5120-32C-AFI)—An AC power cord with a plug appropriate for your geographical location, and a power cord retainer —provided

  • For all the DC-powered models (QFX5120-48Y-DC-AFO and QFX5120-48Y-DC-AFI)—DC power source cables (12 AWG) with ring lugs attached (Molex 190700069 or equivalent) —not provided)

To perform initial configuration of the switch, you need:

  • An Ethernet cable with an RJ-45 connector attached —provided

  • An RJ-45 to DB-9 serial port adapter —provided

  • A management host, such as a PC, with an Ethernet port —not provided

Register product serial numbers on the Juniper Networks website and update the installation base data if there is any addition or change to the installation base or if the installation base is moved. Juniper Networks will not be held accountable for not meeting the hardware replacement service-level agreement for products that do not have registered serial numbers or accurate installation base data.

Register your product at

Update your installation base at


Do not mix AC and DC power supplies in the same chassis.


To prevent ESD damage, wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.


Power supplies and fan modules must have the same airflow direction (all AIR IN (AFI) or all AIR OUT(AFO)). The AFI or AFO label on the power supplies must match the respective AFI or AFO label on the fan modules.