I always thought DSBD meant the recorder was taking a digital feed straight from the board into the digital recording device.
Running SBD > rca > UA-5 > JB3, takes an analog signal from the soundboard into the UA-5 where it is converted to a digital feed for the JB3, right?. I've only run across one soundboard that had a digital out, and that was at a house party. I wound up using the rca analog jacks anyway because I wasn't sure what I'd get from the toslink optical jack.
DAUD would imply digital microphones to me. But I guess everyone has their own ideas...
i always assumed (and this is from pre-taping, maxell xl-IIs dead tape trading days) that DAUD was audience sourced (mics) into a digital recorder (dat) vs the AUD which was just mics into an analog source (reel to reel or cassette)
DSBD was a board source into a digital recorder while SBD was an analog recording.
now that technology has changed, i am not sure if these terms would be accurate... in reference to the quoted post, where there are digi outs on boards and the advent of digital mics (although not widely used).
i will continue to call the things as i am used to until i see a reason not to...