tdif/adat word problems

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ok i'm having a problem. I've got a da78 that I've always just used
analog ins and outs. I bought an apogee fc-8 tdif/adat converter on
ebay recently so i can connect the da78 to the optical in on my maudio
fw1814. I want to transfer from the da78 to pro tools via fw1814. So
i take the optical out of the fc-8 into the optical in on the fw1814.
tdif to tdif. I set the clock on the maudio control panel to external.
It can't detect the sample rate. The fc-8 has a word clock connector
and it's labeled "adat clock" ... does tha tmean in or out? I tried
plugging the word out of the da78 into the fc-8 but same result. if i
plug the word out of the da78 into the word in of the maudio and set
clock source to "word clock" on the maudio control panel then it will
detect the sample rate, but there's a harsh, loud continous signal that
goes through the system. In short, i can't get this set up properly ad
i'm not sure why! i haven't yet been able to find a manual for the
fc-8 and the da78 and maudio manuals leave much to the imagination. I
hope someone here can tell me what to do!

Nate