CAUTION: Ensure that a licensed electrician has attached the appropriate grounding lug to the
grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage
the switch.
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Two 10-32 x .25-in. screws with #10 split-lock washers to secure the grounding lug
Install the QFX5120 in a Four-Post Rack
You can mount the QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches in a four-post 19-in. rack or in a cabinet
that contains a four-post 19-in. rack. In this guide, wel walk you through how to mount the switch in a four-post rack.
1. Review the General Safety Guidelines and Warnings.
2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end to a site ESD
point.
3. Position the switch so that the AIR IN labels on the fan modules are facing the cold aisle, or the AIR OUT labels on the
fan modules are facing the hot aisle.
4. Attach the front mounting brackets to the switch.
5. Lift the switch and position it in the rack. Line up the bottom hole in each mounting bracket with a hole in each rack
post, making sure the switch is level.
6. While you’re holding the switch in place, have a second person insert and tighten the rack mounting screws to secure
the mounting rails to the rack posts. Make sure to tighten the screws in the two bottom holes first, and then tighten
the screws in the two top holes.
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