Attaching the mounting, Brackets to the switch chassis, For the s5820x-28s and – H3C Technologies H3C S5820X Series Switches User Manual
Page 43: S5820x-28c)

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Attaching the mounting brackets to the switch chassis (for the
S5820X-28S and S5820X-28C)
To attach the mounting brackets in one of the mounting positions:
1.
Align the mounting brackets with the screw holes in the front mounting position (
mid-mounting position (
), or the rear mounting position (
). These figures show
how to attach a 1U bracket to the 1U S5820X-28S switch. For how to attach a 2U bracket to the
2U S5820X-28C switch, see
2.
Use M4 screws (supplied with the switch) to fix the mounting brackets to the chassis.
NOTE:
You secure the mounting brackets to both sides of the chassis in the same way.
Figure 26 Attach a 1U mounting bracket in the front mounting position of the S5820X-28S switch
Figure 27 Attach a 1U mounting bracket in the mid-mounting position of the S5820X-28S switch
Figure 28 Attach a 1U mounting bracket in the rear mounting position of the S5820X-28S switch