20-06-2014, 10:32 AM
Bluetooth
[attachment=65086]
Networking
Bluetooth operates on 79 channels in the 2.4 GHz band with 1 MHz carrier spacing.
Each device performs frequency hopping with 1,600 hops/s in a pseudo random fashion.
A very important term in the context of Bluetooth is a piconet.
Radio:
Specification of the air interface, i.e., frequencies, modulation, and transmit power
Baseband:
Description of basic connection establishment, packet formats and timing.
Link manager protocol:
Link set-up and management between devices including security functions and parameter negotiation.
Logical link control and adaptation protocol (L2CAP):
Adaptation of higher layers to the baseband.
Service discovery protocol:
Device discovery in close proximity plus querying of service characteristics.
Bluetooth transceivers use Gaussian FSK for modulation and are available in three classes:
Power class 1: Maximum power is 100 mW and minimum is 1 mW (typ. 100 m range without obstacles). Power control is mandatory.
Power class 2: Maximum power is 2.5 mW, nominal power is 1 mW, and minimum power is 0.25 mW (typ. 10 m range without obstacles). Power control is optional.
● Power class 3: Maximum power is 1 mW.
[attachment=65086]
Networking
Bluetooth operates on 79 channels in the 2.4 GHz band with 1 MHz carrier spacing.
Each device performs frequency hopping with 1,600 hops/s in a pseudo random fashion.
A very important term in the context of Bluetooth is a piconet.
Radio:
Specification of the air interface, i.e., frequencies, modulation, and transmit power
Baseband:
Description of basic connection establishment, packet formats and timing.
Link manager protocol:
Link set-up and management between devices including security functions and parameter negotiation.
Logical link control and adaptation protocol (L2CAP):
Adaptation of higher layers to the baseband.
Service discovery protocol:
Device discovery in close proximity plus querying of service characteristics.
Bluetooth transceivers use Gaussian FSK for modulation and are available in three classes:
Power class 1: Maximum power is 100 mW and minimum is 1 mW (typ. 100 m range without obstacles). Power control is mandatory.
Power class 2: Maximum power is 2.5 mW, nominal power is 1 mW, and minimum power is 0.25 mW (typ. 10 m range without obstacles). Power control is optional.
● Power class 3: Maximum power is 1 mW.