American Fibertek SM9p - Manual (Page 150)

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field is available but the Tagged VID column field is disabled.
 Trunk Link: The extended application of Access Link. It allows the tagged
frames go across 2 or more switches by assigning the tagged VID to the frames.
Having set this link type, the Tagged VID column field is available but the
Untagged VID column field is disabled.
 Hybrid Link: Both Access Link and Trunk Link are available. Having set this
link type, both Tagged VID and Untagged VID column field are available.
 QinQ: It allows user to set the outer tag and inner tag in Untagged VID column
field and Tagged VID column field.

6. Untagged VID: assign the untagged frame VID.
7. Tagged VID: assign the tagged frame VID.
8. Click Apply
9. You can see each port setting in the below table on the screen.