Dell PowerConnect 81 Serie Guide De Mise En Route page 18

3 Slide the plunger bracket forward against the vertical post and secure the
plunger bracket to the post flange with two user-supplied screws.
See Figure 4, item 3.
4 Repeat this procedure for the second rail.
Two-post Center-mount Configuration
1 Slide the plunger bracket rearward until it clicks into place and secure the
bracket to the front post flange with two user-supplied screws.
See Figure 5, item 1.
Figure 5. Two-post Center-mount Configuration
2 Slide the back bracket towards the post and secure it to the post flange
with two user-supplied screws. See Figure 5, item 2.
3 Repeat this procedure for the second rail.
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Installation