AJA FS2 - Manual (Page 172)

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The data formatting and encoding for 708 captions is very different from the data
contained in 608 (SD) captioning, reflecting the added features and capabilities
available with the CEA-708 standard.
When the Caption Translator is on, the FS2 UpConverter automatically translates
incoming line 21 captions to CEA-708 format and inserts the VANC packets into the
converted HD video stream. This is a complete translation from CEA-608 format to
CEA-708 format (including the embedded SD captions).
The FS2 DownConverters automatically intercept and reformat the SD caption data
in the incoming CEA-708 VANC packets, and output it on line 21 of the standard
definition outputs.
Scan Format Scan Format determines how the Deinterlacer handles interlaced vs. pSf inputs.
Normally, this control will only be used to indicate that a 1080PsF25 input is PsF and
not interlaced.
If Auto is selected, the system will look for clues in the source's SMPTE 352 (Payload
ID) data and respond accordingly. If there is no SMPTE 352 information, the system
will assume that 23.98/24 fps sources are PsF, and 25/29.97/30 fps sources are
interlaced.
If Progressive is selected, the system will assume that all sources are PsF (even if
there is SMPTE 352 data to the contrary).
If Interlaced is selected, the system will assume that all sources are interlaced (even if
there is SMPTE 352 data to the contrary).
(19) Scan Format Selections Selection Descriptions
Auto (default)
Progressive
Interlaced
Deinterlacer detects input source payload ID data and sets the
processing format accordingly.
Assumes all input sources are progressive.
Assumes all input sources are interlaced.