Dell S4048T-ON Guide De Mise En Route page 17

Figure 7. Four-Post Threaded Configuration
Install the S4048T-ON System
You can mount the system in the 1U front-rack or 1U two-post (flush and
center) configurations. For the 1U two-post (flush and center) configurations,
slide the system into the rails in the same manner as the four-post
configurations.
The following is an example of a 1U front-rack configuration.
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