Telematic Communication Box (TCB): Aerials/antennas

Up to 3 different aerials are required for the telematics function:

• GSM aerial integrated in roof aerial
• Emergency GSM aerial
• GPS aerial integrated in roof aerial (only if there is no navigation system)

Roof aerial 

The housing of the roof-mounted aerial contains the following aerials:

• Telephone aerial (GSM 1) for mobile phone (GSM stands for Global Standard for Mobile Communications)
• Telephone aerial (GSM 2) for telematics services
• GPS aerial (optional)

(GPS stands for Global Positioning System)

Within the scope of certain optional equipment, further additional aerials which are not for the telephone or telematics may be installed in the roof-mounted aerial (e. g. Digital Audio Broadcasting, Satellite Digital Audio Radio Service).

The following graphic shows the Roof aerial using the example of F01.

Item	Explanation
1	Roof aerial
2	Roof aerial housing
3	Telephone aerial (GSM 2) for telematics services
4	Telephone aerial (GSM 1) for mobile phone
5	DAB L aerial (frequency range: L band), european version or SDARS aerial, US version
6	GPS aerial
7	Connection for telephone aerial (GSM 2)
8	Connection for GPS aerial
9	Connection for telephone aerial (GSM 1)
10	Connection for DAB L aerial, european version or SDARS aerial, US version

Emergency GSM aerial 

The emergency GSM aerial is secured to the storage shelf (can vary depending on vehicle type).

If the restraint systems are activated, the Crash Safety Module sends a signal to the Telematic Communication Box (TCB). The control unit automatically initiates an emergency call, which also contains the location of the vehicle.

An aerial selector is integrated in the Telematic Communication Box (TCB). The aerial selector is used to switch over to the emergency GSM aerial if the GSM aerial in the roof-mounted aerial fails (e.g. due to an accident). Switch-over is carried out automatically if the GSM aerial in the roof-mounted aerial has poorer reception than the emergency GSM aerial.

If the vehicle is not fitted with a navigation system, the Telematic Communication Box (TCB) has its own GPS module and its own connection to the GPS aerial. If the vehicle is fitted with a navigation system, the Telematic Communication Box (TCB) is powered from the headunit with the position data.

During an emergency call, the data is transferred to a server and stored. The data can be used by the service provider for initiating the rescue measures.

Item	Explanation
1	Emergency GSM aerial
2	Aerial output