During the Bluetooth Training,
learn about Bluetooth technology, a short range wireless communications
system connecting many different types of devices, such as mobile
phones, headsets, heart monitors, medical equipment and many other smart
devices.
Fast Facts on Bluetooth
Unlike other wireless
standards, the Bluetooth Core Specification provides product developers
both link layer and application layer definitions, which support data
and voice applications.
Spectrum
Bluetooth technology
operates in the unlicensed industrial, scientific and medical (ISM) band
at 2.4 to 2.485 GHz, using a spread spectrum, frequency hopping,
full-duplex signal at a nominal rate of 1600 hops/sec. The 2.4 GHz ISM
band is available and unlicensed in most countries Interference
Bluetooth
technology's adaptive frequency hopping (AFH) capability was designed
to reduce interference between wireless technologies sharing the 2.4 GHz
spectrum. AFH works within the spectrum to take advantage of the
available frequency.
This is done by the technology detecting
other devices in the spectrum and avoiding the frequencies they are
using. This adaptive hopping among 79 frequencies at 1 MHz intervals
gives a high degree of interference immunity and also allows for more
efficient transmission within the spectrum.
For users of Bluetooth
technology this hopping provides greater performance even when other
technologies are being used along with Bluetooth technology.
Range
Range
is application specific and although a minimum range is mandated by the
Core Specification, there is not a limit and manufacturers can tune
their implementation to support the use case they are enabling.
Range may vary depending on class of radio used in an implementation:
- Class 3 radios – have a range of up to 1 meter or 3 feet
- Class 2 radios – most commonly found in mobile devices – have a range of 10 meters or 33 feet
- Class 1 radios – used primarily in industrial use cases – have a range of 100 meters or 300 feet
Bluetooth Power
The
most commonly used radio is Class 2 and uses 2.5 mW of power. Bluetooth
technology is designed to have very low power consumption. This is
reinforced in the specification by allowing radios to be powered down
when inactive.
The Generic Alternate MAC/PHY in Version 3.0 HS
enables the discovery of remote AMPs for high speed devices and turns on
the radio only when needed for data transfer giving a power
optimization benefit as well as aiding in the security of the radios.
Bluetooth
low energy technology, optimized for devices requiring maximum battery
life instead of a high data transfer rate, consumes between 1/2 and
1/100 the power of classic Bluetooth technology.