Ethernet? USB? S/PDIF? Which connection?

[Urbanluthier]

This post explains why.

Playing DSD .dsf files from the beginning on the Rossini skips the first 0.84 second of audio

It doesn’t actually. It’s just an asynchronous error-corrected packet transport software. Once the UPnP or RAAT packets are “unwrapped” and re-assembled into PCM or DSD, the dCS Streaming board puts them out as identical I²S bitstreams to the rest of the system.