Allied Telesis AT-BSTACK1 - Manual (Page 15)

AT-BSTACK1 Quick Install Guide
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3. Insert the AT-BSTACK1 module into the expansion slot, as shown in
Figure 2. Holding the new module with the text on the front panel upright,
carefully slide the module into the switch slot, ensuring that the edge
connector is fully engaged. Once the module is installed, check to be sure
that the front panel of the module is flush against the switch.
Figure 2 Installing the Module
4. Secure the new module in place with the attached screws.
5. Connect the stack cables to the AT-BSTACK1 Stacking Modules, as shown
in Figure 3. Attach one end of the stacking cable to the stack connector
labeled "DOWN" on the top device, and the other end to the connector
labeled "UP" on the next lower device. Repeat this step until all the
switches have been connected.
Note
The switch with the AT-BMGMT Management Module must be either
the top or the bottom unit of the stack.