Dell PowerConnect 8100 Series Getting Started Manual page 16

1U Tool-less Configuration (Four-post Square Hole or Unthreaded Round Hole)
1 With the ReadyRails flange ears facing outward, place one rail between the
left and right vertical posts. Align and seat the rear flange rail pegs in the
rear vertical post flange. In Figure 3, item 1 and its extractions illustrate
how the pegs appear in both the square and unthreaded round holes.
Figure 3. 1U Tool-less Configuration
2 Align and seat the front flange pegs in the holes on the front side of the
vertical post. See Figure 3, item 2.
3 Repeat this procedure for the second rail.
4 To remove each rail, pull on the latch release button on each flange ear and
unseat each rail. See Figure 3, item 3.
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Installation