Focusrite Scarlett 18i20 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 27)

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Mode 3: Dual ADAT
Select this mode when you need more than four ADAT input and/or output channels when working
at 88.2/96 kHz sample rate.
Digital port
Sample rate (kHz)
44 .1/48 88 .2/96 176 .4/192
Inputs
S/PDIF IN x x x
OPTICAL IN 1 ADAT 1-8 ADAT 1-4 x
OPTICAL IN 2 x ADAT 5-8 x
Outputs
S/PDIF OUT S/PDIF S/PDIF S/PDIF
OPTICAL OUT 1 ADAT 1-8 ADAT 1-4 x
OPTICAL OUT 2 ADAT 1-8 ADAT 5-8 x