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In this document topics covered which are System Architecture, Link manager Protocol, Baseband, Logical Link Control and adaptation protocol , Service Discovery Protocol, Frequency Hopping.
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Link Manager Audio L2CAP
RFCOMM SDP IP
The Radio, Baseband and Link Manager are on firmware. The higher layers could be in software. The interface is then through the Host Controller (firmware and driver). The HCI (Host Controller Interface) interfaces between the baseband and L2CAP provides a command interface to the baseband controller and link manager and access to the hardware status and control registers. The HCI Interface defined for Bluetooth are UART, RS232 and USB. Audio Applications may directly use the basband layer after encoding the audio signals.
System Architecture The core protocols of Bluetooth comprise the following elements:
Bluetooth Air Interface Choices Made ISM Band (^) Global Availability (^) License Free 2,400-2,483.5 MHz in Europe and US 2,471-2,497 MHz in Japan Frequency Hopping (^) Interference from baby monitors, garage door openers, cordless phones and microwave ovens. (^) Spread-Spectrum for interference suppression (^) FH supports low power, low cost radio implementations
1Mhz 83.5 Mhz 1 79
Physical Link (^) Synchronous Connection Oriented (SC0) Link : - classical Telephone (voice)) (^) - symmetric point-to-point link between m and s (^) - reserved 2 consecutive slots at regular intervals (^) - master can support upto 3 simultaneous SCO links