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To install the mounting shelf on the front rails of a four-post rack or cabinet, or the
rails of an open-frame rack:
1. If needed, install cage nuts in the holes specified in Table 22 on page 41.
2. On the back of each rack rail, partially insert a mounting screw into the lowest
hole specified in Table 22 on page 41.
3. Install the mounting shelf on the back of the rack rails. Rest the bottom slot of
each flange on a mounting screw.
4. Partially insert the remaining screws into the open holes in each flange of the
mounting shelf (see Figure 23 on page 42 or Figure 24 on page 43).
5. Tighten all the screws completely.
Figure 23: Installing the Front Mounting Hardware for a Four-Post Rack or Cabinet
42 ■ Installing the Mounting Hardware for a Rack or Cabinet
MX240 Ethernet Services Router Hardware Guide