H3C Technologies H3C S5560 Series Switches - Manual (Page 19)

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Figure 10 Attaching the front mounting bracket to the middle installation position
4. Mount the chassis in the rack:
a. One person supports the chassis bottom with one hand, holds the front part of the chassis with
the other hand, and pushes the chassis into the rack gently
b. The other person uses M6 screws and cage nuts (user supplied) to attach the switch to the rack.
Figure 11 Mounting the switch in the rack (front mounting brackets at the port side)