Q.
Does the iDR system support digital input/output?
A.
The iDR system has digital bus connections for connecting digital signals to/from the iDR-In, iDR-Out and other iDR-8 units, but at the time of writing (February 2004), there are no direct methods of connecting digital i/o such as SPDIF, TOSLINK, AES3 (AES/EBU) etc.
MARCH 2009: there are now digital versions of iDR-IN and iDR-OUT, these have the same chassis and appearance as the analogue versions but have AES/EBU connectors on the rear.
More information is available online here
iDR D-in
iDR D-out