Allied Telesis CentreCOM FS980M Series Quick Installation Manual page 19

To install SFP transceivers, perform the following procedure:
1. To install a transceiver in a top port, position it with the Allied
Telesis label facing up. To install it in a bottom port, position it
with the label facing down.
2. Slide the transceiver into the port until it clicks into place.
To attach the fiber optic cable to the transceiver, continue with
the next step. Otherwise, repeat steps 1 and 2 to install the
remaining transceivers in the switch.
3. Remove the dust cover from the transceiver.
4. Connect the fiber optic cable to the transceiver. The connector
should fit snugly into the port, and the tab should lock the
connector into place.
5. Repeat this procedure to install additional transceivers.
6. Go to "Powering On the Switch" on page 20.
CentreCOM FS980M Series Quick Installation Guide 19