@f4grx @azonenberg At 38C3, someone presented how they did Toslink over fiber using standard SFPs. The TLDR is that 1G SFPs eat pretty much any signal down to a few hundred kHz, and only in 10G SFPs do refiners get into the way. Also they found some newer 1G SFPs are really just relabeled 10G ones and therefore don’t work.

https://media.ccc.de/v/38c3-going-long-sending-weird-signals-over-long-haul-optical-networks