Optical Conversion Not Working, Please Help

Someone with more knowledge will hopefully provide a suggestion in regards to the FMCs. Ironically, I did a deep dive on optical last night. I found threads from WhatsBestForum (here, here, and here) pretty helpful, as well as some from Audiophile Style.

I think the question I have as a follow-up for the community is whether or not that "active" optical cable may also be causing an issue - I candidly don’t know, but I vaguely remember reading this as an issue in one of the threads above.

Like you, I’m still learning while regurgitating some of the information I had been reading last night. I'm pretty confident more members will contribute to help figure this out. As a side note, I've found one of the easier paths is looking at Small Green Computer's solutions, which can be found here and here. 

I would have stuck with something simpler, that has the media converter built in. Keep in mind that 100 MBits is overkill for any streaming of audio or video. 1 Gbit (1000 Mbits) is overkill x 10.

A 192k/24 bit stereo signal is barley 10 Mbits.  A 4K video stream requires around 50 Mbits or less, depending.

So, a 1 Gbit/s cable can carry 20 4k video streams at once.

Maybe that can help you pick out a better integrated adapter and cable such as:

https://amzn.to/45L7WLd

Try a different Toslink cable. The one I got from Blue Jeans does not work in half of devices I've tried.

Make sure that the you are using the proper optical cable. Then make sure you are suing the proper and identical SFP modules compatible with that cable on both ends of the cable. Then reboot your network so your router sees these connections and assigns the proper IP addresses.

Take a look at what these guys sell. Not too expensive and it works great. I have a few OpticalRendu's using their accessories.

Accessories – Small Green Computer