2. ABOUT
⬜ Bluetooth is a radio frequency specification for short
range , point to point and point to multi point voice
and data transfer.
⬜ Bluetooth was named for the 10th century Viking king
,Harald Blatand (A.K.A ,Bluetooth) who peacefully
united all the tiny island kingdoms of Denmark ,
southern Sweden, and southern Norway into one
country
⬜ In keeping with its namesake , Bluetooth ,the new
low-cost radio technology , is designed to unite or
connect all different types of devices to effectively
work as one.
3. HOW IT WORKS
⬜ The technology of Bluetooth centers around a 9mm *
9mm microchip, which functions as a low cost and
short range radio link. Bluetooth Technology provide a
10 meter personal bubble that support simultaneous
transmission of both voice and data for multiple
devices. Up to 8devices can be connected in a piconet,
and up to 10 piconet can exist within the 10 meter
bubble. Each piconet support up to 3 simultaneous
full duplex voice devices.
4. BLUETOOTH CHARACTERISTICS
⬜ It separates the frequency band into hops. This spread
spectrum is used to hop from one channel to another ,
which adds a strong layer of security.
⬜ Up to eight devices can be networked in a piconet.
⬜ Signals can be transmitted through walls and
briefcases,thus eliminating the need for line-of-sight.
⬜ Devices do not need to be pointed at each other, as
signals omni-directional.
⬜ Governments worldwide regulate it , so it is possible
to utilize the same standard wherever one travels.
5. ADVANTAGES OF BLUETOOTH
⬜ No line of site restrictions as with IrDA
⬜ Power consumption makes integrated in battery
powered devices very practical.
⬜ 2.4 GHz radio frequency ensures worldwide
operability.
⬜ Tremendous momentum not only within the
computer industry but also other industries like
cellular telephones and transportation.
6. DISADVANTAGES
⬜ Battery Use: This occurs mostly on your cell phone but
also occurs in other technology such as music players.
You're using up more battery power when you leave
your Bluetooth enabled on your phone all day. To
disregard all this, the best thing that you can possibly
do is disable it once you are completed with the
transfer. It only takes a few seconds to enable and
disable so it wouldn't hurt to disable it once you are
done using it.
7. Continue………
⬜ Bluetooth Internet: Throughout all devices, when
using Bluetooth internet , the connection can
sometimes run very slow so Bluetooth internet is not
highly suggested for all cases.
⬜ As you can notice that there are quite a bit of
advantages and fewer disadvantages. Overall,
Bluetooth is a great thing to be using on all your
devices that supports it. You can do so much with it
and includes cutting all the cords attached to your
devices
10. A piconet is a computer network which links a wireless
user group of devices using Bluetooth technology
protocols. A piconet consists of two or more devices
occupying the same physical channel (synchronized to a
common clock and hopping sequence). It allows one
master device to interconnect with up to seven active slave
devices.
11. A piconet is formed when at least two devices, such as a
portable PC and a cellular phone, connect. A piconet can
support up to eight devices. When a piconet is formed,
one device acts as the master while the others act as slaves
for the duration of the piconet connection.
12. Scatternet
Two or more piconets to form a scatternet One device
simultaneously is master in one piconet and slave in
another.
13. Technical Features
Spectrum
2.4 Ghz ISM open Band
Modulation Gaussion Freqency shift
Keying
Transmission Power 1 miliwatt(mw) - 100mw
Data Rate support station 1mbps
support station 8 device
Data security Authentication 128 bit key
module size 9x9
16. Radio front end:- Defines charecterstics of RF, frequency bands,
channel arrengments and receiver sesitivity level.
Logical link control and adaptation protocol(L2CAP):-
For trasporting bigger data products to higer layer.
SDP:- The Service Discovery Protocol (SDP) allows a device to
discover services offered by other devices, and their associated
parameters.
17. RFCOMM:-
Provides Transport capablites for high level services.
RFCOMM provides a simple reliable data stream to the user,
similar to TCP. It is used directly by many telephony related
profiles as a carrier for AT commands, as well as being a
transport layer for OBEX over Bluetooth.
LMP:- Link manager protocol
piconet, master slave role assignments and link configuration.
Security configration by device authentication using secret key.
