Telephone interface, function - GF82.70-P-3107-02QA

The telephone interface (A34/4) is switched on and off via a discrete wake-up line. It reacts to the voltage drop (level is max. 5 V in quiescent condition) and to the duration of the wake-up signal.

The telephone interface (A34/4) is wired directly to the portable telephone holder for power supply and signal transfer purposes.

Control data coming in from the Media Oriented System Transport (MOST) is passed on via the telephone interface (A34/4) to the portable telephone holder and therefore to the portable telephone itself (A34/6) using discrete data lines.

Thus, upon request from the operating unit, the telephone interface (A34/4) conveys the functions to be carried out (e.g. select phone number, "ON" or "OFF", etc.) to the portable telephone (A34/6). Conversely, the telephone interface (A34/4) transfers data (caller's voice, control data) in an appropriate MOST format and this data is passed to the operating unit for further processing. The telephone interface (A34/4) converts electrical pulses into optical pulses.