H3C Technologies H3C S12500 Series Switches - Manual (Page 29)

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Figure 14 Fastening the screws
4. Use the same method described in step 3 to install the left slide rail to the left rack posts.
Keep the two slide rails at the same height so that the switch can be placed evenly.
Figure 15 Slide rails installed correctly
Installing cage nuts
Before mounting the chassis to the rack, install cage nuts to the front square-holed brackets of the rack.