@soix the right toslink components will handle 24/192 without problem. I use Oppo BDP105 >DH Labs Glass Master toslink cable > Ayre Codex dac. The Ayre display always reads 192 with 24/192 material. Before buying the Codex I asked Ayre if toslink could do 24/192. They said the right transmitter and receiver could, with a good cable.
Thanks,
barondla