1. Data and Computer CommunicationData and Computer Communication
Presentation on :Presentation on :
ByBy
Shweta PatelShweta Patel
IT 2K10 40IT 2K10 40

2. IntroductionIntroduction
 What is Bluetooth?What is Bluetooth?
 Bluetooth is an open wireless technologyBluetooth is an open wireless technology
standard for exchanging data over shortstandard for exchanging data over short
distances.distances.
 It uses short wavelength radio transmissions.It uses short wavelength radio transmissions.
 It uses a wireless protocol that connectsIt uses a wireless protocol that connects
electronic devices when they are close to eachelectronic devices when they are close to each
other.other.

3. HistoryHistory
 Bluetooth is managed by the Bluetooth SpecialBluetooth is managed by the Bluetooth Special
Interest Group (SIG).Interest Group (SIG).
 Created by telecom vendor Ericsson in 1994Created by telecom vendor Ericsson in 1994
 It was standardized as IEEE 802.15.1It was standardized as IEEE 802.15.1
 1999: Bluetooth 1.0 specification introduced.1999: Bluetooth 1.0 specification introduced.
 2005: Bluetooth version 2.0 introduced.2005: Bluetooth version 2.0 introduced.
 2009: Bluetooth version 3.0 introduced.2009: Bluetooth version 3.0 introduced.
 2010: Bluetooth version 4.0 introduced.2010: Bluetooth version 4.0 introduced.

4. How it works?How it works?
 A master Bluetooth device can communicateA master Bluetooth device can communicate
with a maximum of seven devices inwith a maximum of seven devices in
a piconet (an ad-hoc computer network usinga piconet (an ad-hoc computer network using
Bluetooth technology), though not all devicesBluetooth technology), though not all devices
reach this maximum.reach this maximum.

5.  The devices can switch roles, by agreement, andThe devices can switch roles, by agreement, and
the slave can become the masterthe slave can become the master
 The connection of two or more piconets formThe connection of two or more piconets form
a scatternet, in which certain devicesa scatternet, in which certain devices
simultaneously play the master role in onesimultaneously play the master role in one
piconet and the slave role in another.piconet and the slave role in another.

6.  At any given time, data can be transferred betweenAt any given time, data can be transferred between
the master and one other device.the master and one other device.
 No slaves are connected to each other.No slaves are connected to each other.
 The master chooses which slave device to address;The master chooses which slave device to address;
typically, it switches rapidly from one device totypically, it switches rapidly from one device to
another in a round-robin fashion.another in a round-robin fashion.

7. PairingPairing
 Pairing is a bonding procedure that allows you to avoidPairing is a bonding procedure that allows you to avoid
entering access information each time two devicesentering access information each time two devices
establish a connection.establish a connection.
 If Secure Connection is enabled, devices will pairIf Secure Connection is enabled, devices will pair
automatically the first time they connect (a password, orautomatically the first time they connect (a password, or
passkey, must be successfully exchanged).passkey, must be successfully exchanged).
 When you pair two devices, they generate and store aWhen you pair two devices, they generate and store a
common link key so that you do not need to enter thecommon link key so that you do not need to enter the
passkey.passkey.

8.  Wi-Fi is intended as a replacement to LANWi-Fi is intended as a replacement to LAN
while Bluetooth is intended as a replacement ofwhile Bluetooth is intended as a replacement of
cabling for personally carried applications.cabling for personally carried applications.
 Wi-Fi uses same radio frequencies as BluetoothWi-Fi uses same radio frequencies as Bluetooth
but with higher power ,resulting in higher bitbut with higher power ,resulting in higher bit
rates when compared to Bluetooth.rates when compared to Bluetooth.
Bluetooth v/s Wi-FiBluetooth v/s Wi-Fi

9. DevicesDevices
 LaptopsLaptops
 Gaming ConsolesGaming Consoles
 HeadsetsHeadsets
 Mobile PhonesMobile Phones
 PrintersPrinters
 Digital camerasDigital cameras
 GPS receiversGPS receivers

10. AdvantagesAdvantages
 Very easy and simple to use.Very easy and simple to use.
 Connection is fast and simple.Connection is fast and simple.
 More devices are Bluetooth capable.More devices are Bluetooth capable.
 Auto recognition of devices.Auto recognition of devices.
 Battery power requirement is low.Battery power requirement is low.
 Does not needs a clear line of sight betweenDoes not needs a clear line of sight between
synced devices.synced devices.

11. DisadvantagesDisadvantages
 Speed is comparatively less to other sharingSpeed is comparatively less to other sharing
devices.(max of 1 mbps)devices.(max of 1 mbps)
 Since data is transferred over radio waves usingSince data is transferred over radio waves using
Bluetooth, it is much easier for a hacker to breakBluetooth, it is much easier for a hacker to break
into than secure wireless networks. For thatinto than secure wireless networks. For that
reason, Bluetooth should not be used to transferreason, Bluetooth should not be used to transfer
data that needs to remain private and secure.data that needs to remain private and secure.
 It considerably lowers the battery life if leftIt considerably lowers the battery life if left
switched ON on one’s device.switched ON on one’s device.

12. ConclusionConclusion
 Few flawsFew flaws
 SecuritySecurity
 Good for short transfersGood for short transfers
 Limitations on file sizeLimitations on file size
 Limitations on distanceLimitations on distance
 ConvenientConvenient
 FasterFaster
 More simple than flash driveMore simple than flash drive

13. Thank you for listening !!Thank you for listening !!
Questions?Questions?