GF82.85-P-3121RDU Satellite Digital Audio Radio (SDAR) Control Unit, Component Description

GF82.85-P-3121RDU Satellite Digital Audio Radio (SDAR) Control Unit, Component Description
MODEL 172.4
- with CODE (536) SIRIUS satellite radio





N87/5 Satellite digital audio radio (SDAR) control unit

Location
The Satellite Digital Audio Radio (SDAR) control unit is located in trunk on the left side behind the lining on a bracket.

Task
^ Receive signals
^ Amplifying and decoding signals
^ Transmit signals

Receive signals
Signals are read in via the following connections:
^ Direct line
^ Media Oriented System Transport (MOST)

Direct lines
- Circuit 30g
- Circuit 31
- Wake-up
- Multifunction antenna (A28/11) (for satellite signals and terrestrial signals)

MOST
- Control signals from audio equipment

Amplifying and decoding signals
The Satellite digital audio radio control unit (SDAR) decodes and amplifies the satellite signals (Time For Division Multiplex (TDM)) and terrestrial signals (Coded Orthogonal Frequency Division Multiplex (COFDM)) in pulse mode modulation (PCM) signals.

Transmit signals
^ Direct line
^ MOST

Direct line
- Multifunction antenna (power supply to antenna, phantom supply via antenna input)

MOST
- Audio signals to sound system amplifier control unit (N40/3) (with code (810) Sound system) or audio equipment (except code (810) Sound system)
- Status of Satellite Digital Audio Radio (SDAR) control unit, program-specific additional information (e.g. artist, track name and composer) as well as music genre (e.g. "ROCK", "NEWS") to the audio equipment
- Demodulated and decoded digital S-band satellite as well as S-band terrestrial signals as digital traffic and weather data signals to the navigation unit integrated into the COMAND controller unit (A40/3)