T+A Elektroakustik DAC 8 DSD Betriebsanleitung Seite 52

CONTROL
CTRL
MAINS INPUT
52
This interface can also be used for control of the DAC 8 DSD – for
example in combination with a CRESTRON or AMX home
automation system.
A description of the control interface and the control protocol can be
found in the support area of the  website http://www.ta-hifi.com.

The connecting lead required for this is available in the 
accessory range.
The mains cable is plugged into this socket.
For correct connections refer to the sections "Installation and
wiring" and "Safety notes".