Purpose/Design

Fiber optic conductor interface

Purpose
The D2B interface for permanently installed telephone (A59) is required for connection of the CTEL transmitter/receiver (A35) to the digital data bus (D2B).

Additional purpose on vehicles with dynamic guidance (code 815):
Transferring traffic message channel (TMC) traffic data received by the telephone to the traffic data recorder (A2/43)

Design
- D2B interface
- Interface to CAN (telephone)
- Input for D2B wake-up signal