Allied Telesis AT-9448Ts/XP (Basic Layer 3) - Manual (Page 71)

AT-9400Ts Stack Installation Guide
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Figure 32. Removing a Dust Plug for an SFP Slot
2. Remove the transceiver from its shipping container and store the
packaging material in a safe location.
3. Position the transceiver with the label facing up.
4. Slide the transceiver into the slot until it clicks into place.
Figure 33. Installing an SFP Transceiver
5. Verify that the handle on the SFP transceiver is in the upright position
to secure the module in the slot, as shown in Figure 34.