5. WHAT IS BLUETOOTH
Bluetooth is a short range and low power wireless
technology originally developed for exchanging data
over short distance from devices to devices by
creating personal area networks(PAN).
Bluetooth Wireless Technology was invented by a group of
scientists working for the Swedish company Ericsson in
1994. Just four years later, a whole group of companies
began to share the technology to enhance their own projects
and help those products communicate better. So, like a lot
of very cool things in computing, Bluetooth Technology isn't
'owned' by any single entity.
7. THE NAME “BLUETOOTH”
The name “Bluetooth” was borrowed from the 10th-
century, second king of Denmark, King Harald
Blåtand; who was famous for uniting Denmark and
Norway just as we intended to unite the PC and
cellular industries with a short-range wireless link.
10. HOW BLUETOOTH WORK
The Bluetooth standard, uses the FHSS technique
(Frequency-Hopping Spread Spectrum), which involves
splitting the frequency band of 2.402-2.480 GHz into 79
channels (called hops) each 1MHz wide, then transmitting
the signal using a sequence of channels known to both the
sending and receiving stations. It used the ISM band.
11. FREQUENCY-HOPPING SPREAD SPECTRUM
FHSS is a wireless technology that spreads its signal over
rapidly changing frequencies. Each available frequency band
is divided into sub-frequencies. Signals rapidly change
("hop") among these in a pre-determined order. Interference
at a specific frequency will only affect the signal during that
13. COMMUNICATION PRINCIPLE
The Bluetooth standard is based upon a master/slave operational mode. The
term "piconet" is used to refer to the network formed by one device and all
devices found within its range. Up to 10 piconets can coexist within a single
coverage area. A master can be simultaneously connected to as many as 7 active
slave devices (255 when in parked mode). Devices in a piconet have a logical
address of 3 bits, for a maximum of 8 devices. Devices in parked mode are
synchronized, but do not have their own physical address in the piconet.
Two or more Bluetooth units sharing the same channel is
known as Piconets.
One device act as a master and the devices and the
devices connected to it act as slaves.
Slaves can not directly send data to each other.
In effect, the master acts as a switch for the piconet and
all traffic must pass through the master.
There can be up to seven active slaves in a piconet but
only one master.
Class Maximum Power Operating Range Uses
Class 1 100mW (20dBm) 100 meters Industrial Purpose
Class 2 2.5mW (4dBm) 10 meters Normal purpose
Class 3 1mW (0dBm) 1 meter Rarely used
According to power consumption Bluetooth is classified in 3
16. DIFFERENT VERSIONS OF BULETOOTH
This are the different version of Bluetooth technology we have since
1.Bluetooth v1.0 and v1.08 which is mandatory Bluetooth
hardware device address.
2.Bluetooth v1.1 ratified as IEEE standard 802.15.1-2002.
3.Bluetooth v1.2 is the faster connection and discovery.
4.Bluetooth v2.0+EDR it enhanced the data rate.
5.Bluetooth v2.1 is secure simple pairing SSP.
6.BLUETOOTH V3.0 is the high speed data transfer.
7.Bluetooth v4.0 is low energy consumption-recently used in
17. BLUETOOTH WAVELENGTH & FREQUENCY
Bluetooth uses radio frequencies between 2.4 and 2.483GHz. The Federal
Communications Commission set this range aside for low-power general use,
called the industrial, scientific and medical band. The Bluetooth standard breaks
the ISM radio range into 79 separate channels and sends data over combinations
You can calculate the wavelength for any radio signal by dividing the speed of
light in meters per second by the signal's frequency. For Bluetooth, divide
300,000,000 by 2,400,000,000 to obtain .125 meters or 12.5 cm. The relatively
short wavelength allows for a correspondingly short antenna, saving space in
Bluetooth signals typically travel over a distance of 10 to 300 feet. Because
Bluetooth uses radio frequencies, the devices do not have to be within line of
sight of each other.
18. TRANSMISSION TYPES AND RATES
The baseband (single channel per line) protocol combines circuit and
packet switching. To assure that packets do not arrive out of order, slots
(up to five) can be reserved for synchronous packets. As noted earlier, a
different hop signal is used for each packet. Circuit switching can be
either asynchronous or synchronous. Up to three synchronous (voice)
data channels, or one synchronous and one asynchronous data channel,
can be supported on one channel. Each synchronous channel can support
a 64 Kb/s transfer rate, which is fully adequate for voice transmissions.
An asynchronous channel can transmit as much as 721 Kb/s in one
direction and 57.6 Kb/s in the opposite direction. It is also possible for
an asynchronous connection to support 432.6 Kb/s in both directions if
the link is symmetric.
20. WHAT ARE BLUETOOTH ADAPTERS? HOW DO THEY WORK
Bluetooth works by the simple principle of sending and receiving
data in the form of radio waves. Every Bluetooth enabled device
has a card-like attachment known as the Bluetooth adapter. It is
this Bluetooth adapter that sends and receives data. A Bluetooth
adapter has a particular range of connection. One electronic
adaptor can notice another Bluetooth device only if the second
device is present within the range of the first device. When they
are within the range, they can strike up a connection between
themselves. Striking up of connection between two Bluetooth
devices are known as paring of devices.
21. HOW IS THE DATA SENT BETWEEN TWO BLUETOOTH
The radio-wave connection between two devices is used to send
and receive data between two Bluetooth devices. The data send
and received at a time is equal to 720 Kilo bytes per second.
There are 79 frequency channels of a frequency 2.45 Giga Hertz
through which the devices send and receive data to each other.
When two devices are trying to be paired, they are actually
searching for a common frequency through which they can send
and receive data. When such a frequency is discovered, the
devices are "found". The connecting of two devices does not
hamper the connecting of two other devices because they usually
use different channels of frequency and hence do not overlap. In
simple terms, this is the principle behind Bluetooth technology.
It is difficult to send emails while travelling in a flight. On landing of the
flight, the Bluetooth enabled laptop can send the email only when it gets in
touch with the user’s phone.
Wireless mouse and keyboards are introduced.
One will be alerted on his/her mobile phone when laptop receives the mail
You can try to locate a printer via laptop. You will get the printout of that
document once that printer is located.
Transfer data without wires.
To connect smart watch,fitness tracker,PDA,Game controlar, wireless
speakers,GPS receiver with the computer or smart phones.
25. COMPARISION BETWEEN BLUETOOTH AND WIFI
POINT BLUETOOTH WI-FI
POINT BLUETOOTH WI-FI
FREQUENCY 2.4 GHZ 2.4,3.6,5GHZ
SENDING COMPITABILITY ONLY MASTER CAN SEND
EVERY DEVICES PRESENT
IN THE NETWORK CAN
BANDWIDTH LOW(800KBPS) HIGH(11MBPS)
SEQURITY IT IS LESS SEQUERITY SEQURITY ISSUER ARE
ALREADY BEING DEBATED
RANGE 5-30METER 46-92METER
POWER CONSUMPTION LOW HIGH
BIT RATE 2.1MBPS 600MBPS