Allied Telesis 8100S Series - Manual (Page 72)

Chapter 3: Installing the Switch on a Table or in an Equipment Rack
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3. Turn the switch over.
4. For all switches except the AT-8100L/8, AT-8100L/8POE, and
AT-8100S/24C Switches, secure the two rack mount brackets to the
sides of the switch using the eight bracket screws included with the
unit. Figure 24 here and Figure 25 on page 73 illustrate the four
possible bracket positions.
Figure 24. Attaching the Brackets to Install the Switch in an Equipment
Rack