Notes on D2B ring - AH82.70-P-0001-03D

MODEL 129 with CODE 316 (MB D-net telephone (D2B)) with CODE 317 (D-net portable CTEL (D2B)) without CODE 347 (TELE AID emergency call system (D2B)) without CODE 351 (Auto Pilot System (APS)) 

• The components in the D2B ring (station components) in this case are: - Radio (A2)
  • Telephone interface (A34/4)
• The information in the D2B ring only flows in one direction (arrows). The information enters in the white insert (white) in a fiber optic cable module M1 and M2 and exits again in the red insert (red) at the next ring component. The D2B ring only is capable of functioning as a closed circuit.
  Fig 1: Radio Communication Diagram

  Courtesy of MERCEDES-BENZ USA
• The telephone interface (A34/4) is mounted in the left of the trunk on a control unit bracket.
• Before the D2B ring can be expanded it is first necessary to determine the current vehicle configuration
  Fig 2: Identifying Telephone Interface And Control Unit Bracket

  Courtesy of MERCEDES-BENZ USA

Actual configuration in vehicle 

• Print out the actual configuration of the vehicle and use as conversion template.
  Fig 3: Radio And Telephone Interface Configuration Diagram

  Courtesy of MERCEDES-BENZ USA