Allied Telesis AT-MC104LH - Manual (Page 34)

Chapter 2: Installation
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6. If you are installing an AT-MC104XL or AT-MC104LH, repeat Step 4
to cable the second fiber optic port.
Note
End-nodes connected to the media converter must operate with
the same duplex mode, either both full-duplex or both half-duplex.
7. Power ON the end-nodes.
The media converter is now ready for use.