Communication/Security
The system uses the license-free, global Industrial Scientific Medical band (ISM) at 2.45
GHz. This frequency range from 2.402 GHz to 2.480 GHz is subdivided into 79 channels
with a 1 MHz bandwidth.
Signals transmitted through the airways can be scrambled and unscrambled to enhance
communication security. With Bluetooth
TM
technology, communication frequencies are
changed 1600 times per second to reduce the risk of interference or interception of the
transmitted signal. The relatively small operating range of approx. 10 m (32.8 ft) also
enhances the security of this technology, since tampering with the transmitted data is
only possible when inside the 10 m (32.8 ft) wireless "network".
To further enhance the security of this short-range wireless network the ULF system
requires a pairing procedure to be carried out for each device that will be introduced into
the network. As part of this procedure a required passkey must be entered once (during
the initial pairing procedure) to establish a secure connection between the phone and the
ULF Control Module.
Data and Voice
Bluetooth
TM
was developed for the transmission of both voice as well as data. A band-
width of approx. 1 MB/s is available for this purpose.
Bluetooth
TM
Enabled Phones
Ideally all phones that are Bluetooth
TM
enabled should work with the ULF system, howev-
er not all phones utilize the same profiles and therefore may not be recognized by the
ULF System. A list of recommended Bluetooth
TM
enabled phones is available from your
BMW Center.
Advantages of the ULF System
• Once a phone is paired to the system it will be able to automatically connect to the
Bluetooth
TM
wireless network of the vehicle, the next time it is introduced into the
vehicle and the vehicle ignition is on.
• Up to four different Bluetooth
TM
phones can be paired to the system at one time,
although only one phone can be wirelessly connected at any time.
• The phone does not need to be inserted into a phone specific cradle in order to be
integrated into the vehicle.
• The phone can remain in a briefcase, purse, glove box, etc.; as long as it is turned on
and located within the interior of the vehicle.
• The MFL buttons on the steering wheel can be utilized to place or receive a call, to
scroll the phone book and select a number or activate voice recognition in order to
dial a number via voice command.
4
Bluetooth
TM