Allied Telesis x310 Series - Manual (Page 86)

Chapter 6: Cabling the Stacking Ports
86
5. Remove the dust cover from the S2 slot in the next switch in the stack
as shown in Figure 40.
Note
The cable must crossover to different slots on the switches. The
stack will not work if you connect two S1 or S2 slots together.
Figure 40. Removing the Dust Plug from the S2 Slot
6. Remove the dust cover from the connector on the other end of the
transceiver.
7. Position the transceiver with the release tab on the bottom and slide it
into the slot until it clicks into place, as shown in Figure 41 on page 87.