I own both Fireface 800, as well as babyface pro.

They are connected to different computers, but I thought, why not link them together in my main studio via toslink.
This will help me skip the firewire connection, If I use the babyface as the master.

If I do so I know I will loose 2 channels from the ff800, which supports only 8 channel via adat, but 8 channels + 4 channels from the bfpro is plenty for me (as long as I stay on the 48k sample rate.

My question is, how exactly do I do this?
Can I send 48v to the adat channels on the ff800? or the ff800 still needs to be connected via firewire.
How to set the clock, and tell the ff800 it's a slave from now on, if I don't plug it in?

If anyone out there has done this, I would love to hear your experience.

Here's some bg if you want to read more:
Both rme are working great, however I do have some conflict on my computer that I can't seem to resolve, blue screen with error message IRQL Not Equal Not Less.
I think it comes from either the firewire pci card, or my graphic card (only two non original components to my dell xps 8940).
So, I am taking the opportunity to bypass the firewire, which getting outdated more and more.

Would love some input.

Thanks,