3com 4800G Installation Instruction

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Installing the Switch into a 19-Inch Cabinet
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Figure 22   Fix front mounting ears and load-bearing screws
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There are three positions to mount a load-bearing screw on both sides of a switch 
(only two positions on both sides of the Switch 4800G 48-Port). You should select 
a proper position according to the actual requirements. The rear mounting ears 
support the switch by tightly contacting with the load-bearing screws.
Select a position to install the switch and fix the rear mounting ears to the rear 
brackets with screws and captive nuts, as shown in Figure 23. 
Figure 23   Fix rear mounting ears
 
Hold the bottom of the switch with one hand and the front part of the switch with 
the other hand, and push the switch into the cabinet gently, as shown in 
Figure 24.
Screw 1: Load-bearing screw
 
Front panel
Front mounting ears
Screw 1
Optional positions for screw 1 
 
Rear square-holed bracket
Rear mounting ears