GF82.70-P-3114-04TU Telecommunications Control Unit, Function
GF82.70-P-3114-04TU Telecommunications Control Unit, Function
- with CODE (528) HIGH Class USA
The telecommunications control unit (N112) can be operated with the hands-free system and is fitted as standard. It bundles and controls all the services such as E-Call and the Info-Service.
The device can be woken up as follows:
^ Wake up line (triggered by the COMAND operating, display and control unit (A40/3))
^ SOS/ATA [EDW] switch group (S93/3)
^ MB-Info and breakdown assistance button group (S93/6)
^ Incoming call
^ Diagnosis inquiry of the central gateway control unit (N93)
For some applications, e.g. seeking messages from the Service Center, the telecommunications control unit (N112) is woken up from standby on a cyclical basis, without activating the connected networks.
The communications system is fitted and configured at the factory. Irrespective of the communication standard all configurations have identical wiring harnesses, plugs and housings with identical dimensions. The modular designed communications platform carries the printed main circuit (mainboard). The main board comprises the communications platform, ROM memory and RAM memory, the interfaces to the diagnosis and to the MOST (Media Oriented System Transport) as well as discrete vehicle interfaces. The telecommunications control unit (N112) is designed so that the main board components can be removed or replaced The following components can be upgraded individually:
^ RAM, ROM memories
^ CPU performance
^ Wireless communications systems
^ GPS computer
Authorization
In order to be able to put the telephone system into operation with the corresponding service provider, an authorization is required, i.e. the input of person-related and vehicle-related data into the control unit coded by the plant must be carried out and passed on to the authorization center (Customer Assistant Center (CAC)). A service is authorized when it is technically useable.
Telephoning via portable CTEL (A34/6)
USA vehicles are equipped for the retrofitting of MOTOROLA TDMA, CDMA and GSM portable CTELs.
The following functions are possible via the portable CTEL (A34/6):
^ Portable CTEL, short message service (SMS)
^ Phonebook download onto the COMAND operating, display and control unit (A40/3)
VT card
The traffic telematics card is permanently installed in the telecommunications control unit (N112) and is a component of the vehicle. With this card the contract exists between DC-AG and the mobile phone provider. The customer can only make use of vehicle-based telematics services using this card. The customer requires an additional SIM card for voice calls which are not in direct relationship with vehicle-related services.
Emergency call function
Safety software such as E-call (emergency call) and telediagnosis runs on the telecommunications control unit (N112). Therefore, an independent GPS module is needed, which supplies the system with the data for position finding. The GPS module contains a GPS receiver with gyro sensor. An external GPS antenna is necessary in order to be able to receive satellite data.
Operation in the event of an emergency call or roadside assistance call
Operation in the event of an emergency call takes place via the SOS switch (S93/3s1); a roadside assistance call is made via the MB info and breakdown assistance button group (S93/6). The subsequent telephone conversation is processed solely via the hands-free system. Emergency call and telediagnosis require a system-independent sound input and output for emergencies. In case of emergency the voice output takes place via two separate speakers.
The connection to the hands-free system microphone group (A67b1) and to the speaker is diagnosis-capable. The telecommunications control unit (N112) is diagnosis-capable on a discrete basis.
The GPS antenna (A2/49a2) (model 211.0) or the GPS antenna (A2/23) (model 211.2) is used jointly with the navigation system via the GPS antenna splitter (A2/5).
Emergency call after an accident
Via the restraint systems control unit (N2/7), the telecommunications control unit (N112) receives the crash signal, whereupon an emergency call is initiated. The GPS module supplies the position data. As a result the emergency call is routed directly to the emergency call center via the telephone transmission unit.
Microphone/speaker
The telecommunications control unit (N112) takes over control via the microphone, by applying a DC voltage at the level of 8 V at the microphone input. The analog audio signal is routed by the telecommunications control unit (N112) via a relay.
The voice is input via the hands-free system microphone group (A67b1) in the inside rearview mirror. The voice output takes place via the central speaker.
The following services are available in the USA:
^ Roadside Assistance
^ E-call
^ MB-Info and breakdown assistance
Telephone operation
The hands-free system is needed for telephone operation. Activation and operation takes place via the COMAND operating, display and control unit (A40/3) and the voice control system (VCS).
The phone conversation can be processed via the telephone handset (A34) and the hands-free system.
The transmission/receiver unit in the telecommunications control unit (N112) leads to the data transfer (caller's voice, control data, telephone numbers) to the telephone antenna (A2/49 a1).
Vice versa the incoming vibrations are converted into digital signals, converted into light pulses again and sent to the respective control units.
E-Call is standard equipment for USA vehicles.
Internet
Internet messages, such as phone calls, are transmitted via the cellular radio system. The messages received from the internal transmission/receiver unit are processed in the Internet browser (computer) likewise integrated in the telecommunications control unit (N112) and are lead to the central computer of the COMAND operating, display and control unit (A40/3). Both computers are continuously communicating with one another.