Dell PowerConnect 81 Serie Guide De Mise En Route page 20

Installing the Switch
The switch may be mounted in the 1U front-rack and 1U two-post (flush and
center) configurations. The following is an example of 1U front-rack
configuration. The 1U two-post (flush and center) configurations, you can
slide the switch into the rails in the same manner as the four-post
configurations.
1U Front-rack Installation
The rails that are attached to the switch must be configured.
1 Attach the switch rails (inner chassis members) to the PC81xx switch.
Figure 7, item 1 shows the detail for the front standoff with locking tab.
Figure 7. Attaching the Switch Rails
2 After both switch rails are installed, line them up on Ready-Rails previously
mounted to the rack and slide the switch in until flush with front of rack.
About 3inches prior to full insertion, the rail locking feature will engage to
keep the switch from inadvertently sliding out of the rack and falling.
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Installation