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Universal Bluetooth
TM
Hands-Free System (ULF)
5
Wireless Communication
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
bandwidth 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, however 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.