Thursday, 29 May 2014

Introduction To Bluetooth

Introduction To Bluetooth

Bluetooth was designed to allow low bandwidth wireless
connections to become easy to use so even those who
are new to wireless can use them.  Version 1.1 of 
Bluetooth describes a low power, short range wireless
networking technology that uses radio waves to send
data at rates up to 720 kilobits a second.

The specification for Bluetooth provides for different
classes of radio that allow transmission ranges of
up to 100 meters by boosting the radio power.  The
technology of Bluetooth isn't limited to line of 
sight transmission since it uses directional waves
that are capable of transmitting through many 

Bluetooth is an industry standard communication of
wireless, meaning that it enables the connection
of other devices as well, such as cell phones,
computers, digital cameras, and other types of
electronic devices.  The specification of Bluetooth
defines a radio system and a "stack" of protocol 
layers and profiles.  The highest layer is the
application layer, while the lowest layer is the

The wireless technology of Bluetooth is positioned
to revolutionize the personal connectivity market
by providing freedom from inconvenient fixed type 

The specification for Bluetooth eliminates the need
for cables by providing a small form factor, low
cost wireless solution that will link computers,
cell phones, and other electronics.  Bluetooth
also allows users to connect many ranges of devices
quickly and easily and expands communications 
capabilities as well.

The size of the Bluetooth radio is amazing, as a
Bluetooth radio can be built into one or two very
small microchips then integrated into any electronic
device where wireless operations would be an 

Bluetooth also offers a robust link, which ensures
that normal operating circumstances are not 
interrupted by interference from other signals
that are operating in the same frequency band.

Also known for its worldwide operation, Bluetooth
radio operates in the 2.4 GHz frequency band, which
is license free and available to any type of 
radio system in the world.  No matter where you
are in the world, you count on Bluetooth to work.

Security is also important.  Offering advanced
security mechanisms, Bluetooth ensures a high level
of security.  Therefore, authentication will 
prevent unauthorized access to important data and
make it very difficult to listen in.

Bluetooth also boasts power optimization.  The radio
is power friendly and the software for Bluetooth
is very configurable, limiting the power consumption
of equipment.  The radio itself only consumes a 
small amount of power from a cellular phone.

Using Bluetooth

Using Bluetooth

The amazing technology of Bluetooth presents a great
way of exchanging data between two wireless devices.
Unlike telephones, there are no wires or messy 
leads to worry about.  You can enjoy wireless 
communications with short distances of up to thirty

Bluetooth also offers interoperability, meaning that
you can use your portable Bluetooth device to connect
with existing Bluetooth points.  This way, you won't
have to carry a data lead or CDs of drivers around
with you everywhere you go.  You can enjoy the best
of wireless without having to worry about installing
your software.

With today's Bluetooth, you can use your PDA and cell
phone to surf the net or check emails as you travel.
If you are in the business field, this can be very
beneficial, especially if you like to check your
email throughout the day.  Bluetooth will enable you
to check your email no matter where you are - which
is great news for those who like to travel.

Bluetooth will also enable to you to transfer files
as well, such as MP3 and photo to and from your mobile
device.  Bluetooth dominates the world of short range
wireless, enabling you to do more than you may 
have thought possible.

One of the best things to Bluetooth and something
everyone loves is the wireless headset.  Bluetooth
offers wire free headsets for your cell phone or
computer, which is great for those who like to walk
around or talk on the phone in the car, without 
having to worry about your hands getting in the way.

To make things even better, you can use a Bluetooth
GPS device for satellite navigation on your PDA,
laptop, or mobile.  If you travel - this can be 
really great to have.

10 Benefits Of Bluetooth

10 Benefits Of Bluetooth


1.  Wireless

As you probably already know, there are many benefits
and advantages to using wireless devices.  Along with
improving safety as a result of eliminating wires
you don't need, wireless also offers you plenty of
other advantages.  When traveling with your laptop 
or other wireless devices, you'll no longer have to
worry about bringing connection cables.

2.  Bluetooth is actually inexpensive

The technology of Bluetooth is cheap for companies
to implement, which results in lower costs for the
company.  These savings are then passed from the
company on to you.

3.  Bluetooth is automatic

Bluetooth doesn't have you set up a connection or
push any buttons.  When two or more devices enter 
a range of up to 30 feet of each other, they will
automatically begin to communicate without you 
having to do anything.  

4.  Standardized protocol

Bluetooth is standardized wireless, meaning that
a high level of compatibility among devices is 
guaranteed.  Bluetooth will connect devices to
each other, even if they aren't the same model.

5.  Low interference

Bluetooth devices almost always avoid interference
from other wireless devices.  Bluetooth uses a 
technique known as frequency hopping, and also 
low power wireless signals.

6.  Low energy consumption

As a result of Bluetooth using low power signals,
the technology requires very little energy and will
use less battery or electrical power as a result.
This is an excellent benefit for mobile devices, 
as Bluetooth won't drain the battery.

7.  Sharing voice and data

The standard for Bluetooth will allow compatible
devices to share data and voice communications.
This is great for mobile phones and headsets, as
Bluetooth simplifies driving and talking on your
cell phone.

8.  Instant PAN (Personal Area Network)

You can connect up to seven Bluetooth devices to
each other within a range of up to 30 feet, forming

a piconet or PAN.  For a single room, you can
also set up multiple piconets.

9.  Upgradeable

Upgradeable is the standard for Bluetooth.  There
are newer versions of Bluetooth in the works, 
which offer many new advantages and backward 
compatible with older versions.

10.  The technology stays

Bluetooth technology is a world wide, universal
wireless standard.  With it being as popular as
it is, you can count on it being around for years
to come.  As more and more devices start to use
Bluetooth technology, more manufacturers will be
eager to make their products compatible.  A chain
reaction will occur, making Bluetooth the standard
for cutting edge wireless.

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How Bluetooth Works

How Bluetooth Works

Bluetooth devices will normally operate at 2.4 GHZ
in the license free, globally available ISM radio
band.  The advantage to this band includes worldwide
availability and compatibility.  A disadvantage to
this however, is that the devices must share this
band with other RF emitters.  This includes
automobile security systems, other wireless devices,
and other noise sources, such as microwaves.

To overcome this challenge, Bluetooth employs a
fast frequency hopping scheme and therefore uses
shorter packets than other standards within the
ISM band.  This scheme helps to make Bluetooth
communication more robust and more secure.

Frequency hopping
Frequency hopping is basically jumping from frequency
to frequency within the ISM radio band.  After a
bluetooth device sends or receives a packet, it
and the device (or devices) it's communicating with
hop to another frequency before the next packet is
sent.  This scheme offers three advantages:
1.  Allows Bluetooth devices to use the
entirety of the available ISM band, while never
transmitting from a fixed frequency for more than a
short period of time.  This helps insure that
Bluetooth conforms to the ISM restrictions on the
transmission quantity per frequency.
2.  Ensures that any interference won't
last long.  Any packet that doesn't arrive safely
to its destination can be resent to the next
3.  Provides a base level of security as
it's very hard for an eavesdropping device to predict
which frequency the Bluetooth devices will use

The connected devices however, must agree upon the
frequency they will use next.  The specification
in Bluetooth ensures this in two ways.  First, it
defines a master and slave type relationship between
bluetooth devices.  Next, it specifies an algorithm
that uses device specific information when
calculating the frequency hop sequences.

A Bluetooth device that operates in master mode can
communicate with up to seven devices that are set in
slave mode.  To each of the slaves, the master
Bluetooth device will send its own unique address
and the value of its own internal clock.  The
information sent is then used to calculate the
frequency hop sequences.

Because the master device and each of the slave
devices use the same algorithm with the same initial
input, the connected devices will always arrive
together at the next frequency that they have agreed
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As a replacement for cable technology, it's no
wonder that Bluetooth devices are usually battery
powered, such as wireless mice and battery powered
cell phones.  To conserve the power, most devices
operate in low power.  This helps to give Bluetooth
devices a range of around 5 - 10 meters.

This range is far enough for wireless communication
but close enough to avoid drawing too much power
from the power source of the device.

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