RME Audio ADI-4 DD User Manual page 23

AES/EBU
The XLR connectors are wired according to AES3-1992:
1 = GND (shield)
2 = Signal
3 = Signal
AES/EBU and SPDIF are biphase modulated signals, therefore polarity doesn't matter. Pins 2
and 3 are neither hot nor cold, they carry the same signal. But as AES3 uses a balanced trans-
mission they are inverted in polarity.
User's Guide ADI-4 DD © RME
23