Some additional info and scenarios:

a) rosetta sample rate 44.1 ---> babyface input status sync 44.1
b) rosetta sample rate 48 ---> babyface input status sync 48
c) rosetta sample rate 88.2 ---> babyface input status sync 44.1
d) rosetta sample rate 96 ---> babyface input status sync 48
e) rosetta sample rate 176.4 ---> babyface input status NO LOCK
f) rosetta sample rate 192 ---> babyface input status NO LOCK
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a) and b) seems to me ok, also e) and f) are ok.
c) and d) I don't know.

with low freq, rosetta adat orange light only is on. At high freq orange adat and smux light is on:
https://ibb.co/BC0j3hr

bye again
mat

Thank you for reply.
I know smux protocol operate at 48khz on two channel and result in 96khz stream.

However, since there is no smux transfer indicator in babyface,
one would find it easier to read 96k to be sure of correct operation, otherwise it is easy to remain in doubt.
or 48kh (smux) for example.
or 48kh (x2)

... I belive and sorry for my bad english.

Thank you again.

Maybe I do something useless but when I use the 96k rosette, I also set the babyface to 96k sample rate. If the babyface sample rate is 96k, shouldn't the adat channel operate in smux mode? I mean that the currently set sample rate could be an indicator.

Please don't consider my tone polemical, he doesn't want to be.

about sample rate: I noticed that if I set eg. 96k of sample rate on the babyface and in the Rosetta frequency change, ad 44.1, 48, ...., 192k, the babyface sample rate swap from 96k to 88.2k each rosetta step.