Dell Networking S3100 Series Getting Started Manual page 12

3. Front standoff with locking
tab.
2. After you have installed both switch rails, line them up on the previously
mounted Ready-Rails and slide the switch in ( item 1 in the following
figure) until it is flush with front of rack. About 3 inches before you fully
insert your system, the rail locking feature (items 2 and 3) engages to
keep the switch from inadvertently sliding out of the rack and falling.
Figure 6. Installing the Switch in a Front-Rack Configuration
1. Chassis.
3. Rail locking feature.
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2. Rail end.
Installation