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GENERAL BLUETOOTH QUESTIONS
What is Bluetooth?
Bluetooth is a wireless technology that allows two different devices to connect to one another. It is a universal
protocol making it available for all devices from any brand. The purpose of Bluetooth is to replace the cables
that normally connect devices, while still keeping the communications between them secure.
How does Bluetooth work?
Bluetooth operates in the 2.4-2.483 GHz license-free Industrial, Scientific, and Medical (ISM) frequency bands.
All devices connected together are forming a small network named piconet. At any given time, data can be
transferred between the leader and one other device. The leader chooses which follower device to address.
Bluetooth uses adaptive frequency hopping to avoid interference. The piconet's radio channel is shared by the
group of followers that are synchronized to the leader's clock and hopping frequency to ensure alignment.
What are Bluetooth profiles and what are they for?
Bluetooth profiles are a set of rules that allow the technology to complete a particular task. For example, to
connect a pair of headphones to another device, a specific Bluetooth profile (or rules) is used. A different
Bluetooth profile is needed to listen to high quality stereo music.
HFP: Hands-Free Profile (HFP) is a Bluetooth profile in which sounds get transmitted and received by both
devices, like a phone call. This Bluetooth profile is necessary for devices such as mobile phones, headsets,
and in-vehicle equipment.
A2DP: Advanced Audio Distribution Profile (A2DP) is the Bluetooth profile that characterizes how multimedia
audio is streamed from one device to another. This profile allows for the transmission of high-quality stereo
audio such as music streamed from a mobile phone.
What is Bluetooth LE?
Bluetooth Low-Energy (LE) uses frequency hopping wireless technology in the 2.4 GHz unlicensed radio band
to interconnect nearby devices. Bluetooth LE is slower than Bluetooth Classic (about one third of the speed),
but only uses half the power. Bluetooth LE is perfect for devices that only need to send tiny bits of data and
that can operate with very low power consumption. Bluetooth LE remains in sleep mode unless a connection is
initiated. Bluetooth LE is also known as Bluetooth Smart.
How is Bluetooth LE different than Bluetooth Classic?
The power consumption of Bluetooth Classic is greater than Bluetooth LE as Bluetooth Classic maintains the
connection between the two devices at all times. There is constant data transmission with Bluetooth Classic,
so it is ideal for streaming audio signals like phone calls and music, whereas Bluetooth LE sends data
periodically. The transmission range is similar for both protocols.
For what purposes does Marvel CI use Bluetooth LE?
Marvel CI uses Bluetooth LE to connect to:
•
Phonak RemoteControl
•
Noahlink Wireless
•
AB Remote mobile application
Bluetooth LE is ideal for these applications that do not require continuous connection but depend on long
battery life.
For what purposes does Marvel CI use Bluetooth Classic?
Marvel CI uses Bluetooth Classic to connect to:
•
Any Bluetooth-enabled device for media streaming
•
Bluetooth phones for phone calls
Bluetooth Classic is designed for continuous two-way data transfer. It is highly effective, but only for short
distances. This is a perfect solution in the case of streaming audio and video, and phone calls, all needing a
continuous, broadband link.
Marvel CI
Bluetooth Resource