Juniper EX4200 Hardware Manual page 121

One pair of rear mounting-blades (provided with the four-post rack-mount kit)
Screws to secure the chassis and the rear mounting-blades to the rack (not provided)
Dust covers for ports (for EX4200-24F switches only; optional)
NOTE: One person must be available to lift the switch while another secures it to the rack.
CAUTION:
the bottom of the rack and mount the other units from the bottom of the rack to the
top in decreasing order of the weight of the units.
To mount the switch on four posts in a rack:
1. Attach the front-mounting brackets (either the flush or the 2-in.-recess brackets) to the side
mounting-rails using six 4-40 flat-head Phillips mounting screws. See
Figure 33: Attaching the Front-Mounting Bracket to the Side Mounting-Rail
1 Side mounting-rail
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2. Place the switch on a flat, stable surface.
3. Align the side mounting-rails along the side panels of the switch chassis. Align the two holes in the rear
of the side mounting-rails with the two holes on the rear of the side panel.
If you are mounting multiple units on a rack, mount the heaviest unit at
Figure 33 on page
2 Front-mounting bracket
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121
121.