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

GF82.85-P-3121CA Satellite Digital Audio Radio (SDAR) Control Unit, Component Description
MODEL 207.3 /4
- with CODE (536) SIRIUS satellite radio as of model year 2011 /YoM 10





Illustrated on model 207.3
N87/5 Satellite digital audio radio (SDAR) control unit

Location
The SDAR control unit is located in the center of the trunk below the trunk mat on the equipment carrier.

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

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

Media Oriented System Transport (MOST)
- Control signals from COMAND controller unit (A40/3)

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

Amplifying and decoding signals
The SDAR control unit decodes and amplifies the satellite signals (Time Division Multiplex (TDM)) and terrestrial signals (Coded Orthogonal Frequency Division Multiplex (COFDM)) into pulse code modulation (PCM) signals.

Transmit signals
^ MOST
^ Direct line

MOST
- Audio signals to sound system amplifier control unit (N40/3) (with code (810) Sound system)
- Status of SDAR control unit, program-specific supplemental information (e.g. artist, track name and composer) as well as music genre (e.b. "ROCK", "NEWS") to the COMAND controller unit
- Demodulated and decoded digital S band satellite and S band terrestrial signals as digital traffic data signals (as of 1.7.2011 weather data as well) to the navigation unit in the COMAND controller unit (with code (512) COMAND APS with DVD changer or with code (527) COMAND APS with single DVD drive (with navigation))

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