Cellular telephone (GSM 900 MHz) on/off characteristics, function - GF82.70-P-2005BA

MODELS 129, 170, 202, 208, 210, 215, 220 with CODE (316) MB GSM cellular telephone (D2B) 

On / off characteristics of D2B telephone (fixed installation) 

The characteristic of the D2B telephone in the D2B ring is solely dependent on the state of terminal 15 (ignition ON/OFF). Information regarding the state of terminal 15 is sent to the D2B interface fixed installation (A59)  from the Head Unit (COMAND/radio) via the D2B ring. The D2B interface fixed installation (A59)  is not electrically connected to terminal 15 and switches the CTEL transmitter/receiver (A35)  on or off when commanded by the Head Unit, via the D2B ring or an external wake-up circuit.

After the ignition is switched off the D2B interface fixed installation (A59)  and therefore the telephone remains switched on for an overshoot period of t=10 min. before being switched off. It is not possible to reprogram the overshoot period.

System performance 

The D2B interface fixed installation (A59)  has three operating states.

• Powerdown mode

  The D2B interface fixed installation (A59)  is switched off with the exception of the external wake-up circuit.

• Idle or overshoot time mode

  The remaining components in the D2B ring are switched off, only the D2B interface fixed installation (A59)  remains active for t=10 min after the D2B ring has been switched off (ignition OFF). Each further key operation, during the overshoot period, extends the overshoot period by t=60 min.

• Active mode

  Both the D2B interface fixed installation (A59)  and the other components in the D2B ring remain active and available to the user.

Switch-on operation 

1. Current state: ignition ON, D2B interface fixed installation (A59)  is in inactive mode (powerdown mode), the telephone system is not operational.

   The D2B interface fixed installation (A59)  is activated (active mode) when:

   • The telephone is switched on by the handset
   • a telephone that is in the receptacle is switched on and makes a call (incoming/outgoing)
   • a wake-up signal of another D2B ring subscriber is recognized via the external wake-up circuit
2. Current state: ignition OFF, the D2B interface fixed installation (A59)  is in the overshoot phase (idle mode) and the D2B ring is in inactive mode (switched off)

   The D2B interface fixed installation (A59)  is activated (active mode) when:

   • a telephone that is in the receptacle is switched on and makes a call (incoming/outgoing)
   • a wake-up signal of another D2B ring subscriber is recognized via the external wake-up circuit

Switching-off process 

The D2B interface fixed installation (A59)  is in the overshoot phase (idle mode) and the D2B ring is switched off.

The following cases are possible depending on the status of terminal 15:

• Terminal 15 ON

  After expiry of the overshoot period of t=10 min (no further telephone key operations during the overshoot period) the D2B interface fixed installation (A59)  switches off (powerdown mode). The status of the telephone is not altered here, in other words, a switched on telephone remains so and is not  switched of by the D2B interface fixed installation (A59)  .

• Terminal 15 OFF

  After expiry of the overshoot period of t=10 min (no further telephone key operations during the overshoot period) the D2B interface fixed installation (A59)  switches off (powerdown mode). The status of the telephone is altered here, in other words, a switched on telephone is switched off  by the D2B interface fixed installation (A59)  .

When the D2B ring is deactivated the D2B interface fixed installation (A59)  is switched off if the telephone is not switched on.

Telephone interface, position/task/design/function

The telephone and D2B interfaces are identical components

GF82.70-P-3107F