Sony SAT-B2 - Manual (Page 21)

Chapter 3: Connecting Your System 21
Connecting Digital Audio Components (SAT-A2 Only)
The digital audio output connector allows you to connect a digital
audio component that has a digital optical audio input connector, such
as a MiniDisc (MD) or digital audio tape (DAT) recorder.
Note
The digital audio component must have a digital input frequency of 48 kHz.
Check your component’s instruction manual to determine the digital input
frequency of your component.
To connect a digital audio component:
Connect the DSS receiver’s DIGITAL OUT connector to the audio
component’s digital audio input connector, using the component’s
digital optical cable.