I received your email and I forwarded it, waiting for a reply. Unfortunately, I personally don't have a DF Ravenna at my disposal. Did you also test signal flow the other way round?

We have tested it with Directout Prodigy and it's working both ways in standalone. But you need to configure and activate the Ravenna module acordingly in the DF Ravenna.

Page 8 user manual :

Stand-alone Operation
The Digiface Ravenna can be used stand-alone, powered by the included power supply. Alterna-
tively USB bus power from a USB power wall wart or USB battery can be used. When not con-
nected to a computer host the device operates as 64 channel MADI to/from RAVENNA con-
verter. All channels are transferred to the other format unchanged, both ways.

To make most use of the additional phones output, a submix of all MADI and RAVENNA input
channels can be set up in computer-connected operation, and stored in the Digiface Ravenna for
stand-alone operation. To store the current Submix Phones go to TotalMix FX Options, Store
current State into Device -> Submix Phones and Settings.

It would be helpful if RME/Direct-Out could create some simple examples of some common config of the stand-alone operation, in particular. Something like, one PC for management interface, one ravenna interface, stand alone operation of Digiface Ravenna.

The network setup for the RAV.IO module is not trivial and the documentation from DO also lacks any examples that would help significantly. The switch operation is confusing, as it is not a "normal" switch, the ports are separate NIC's with different subnets required.

I can get audio routing with an additional switch, but cannot without this, as I can't seem to successfully setup IP addresses for the management interface and for the Ravenna devices, not to mention setting master slave PTP clocks, that works. Thank goodness for the third party Merging Aneman to assist with setup. I am yet to try Globcon, plan to try this next.

I also cannot find any support endpoints from DO for questions.