Dell S4048T-ON Guide De Mise En Route page 19

Figure 9. Installing the S4048T–ON in a Front-Rack Configuration
1. Chassis.
3. Rail locking feature.
Completing the Ground Wire Installation
After you have installed the S4048T-ON switch in a rack, complete the
installation of the ground wire.
You previously installed the GND lug and bracket assembly, with ground wire
attached, to the S4048T-ON chassis (see Installing the Ground Lug and
Bracket Assembly).
You must supply:
2. Rail end.
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