Data and Computer Data and Computer CommunicationCommunication

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Shweta PatelShweta Patel

IT 2K10 40IT 2K10 40

IntroductionIntroduction

What is Bluetooth?What is Bluetooth? Bluetooth is an open wireless technology Bluetooth is an open wireless technology

standard for exchanging data over short standard for exchanging data over short distances.distances.

It uses short wavelength radio It uses short wavelength radio transmissions.transmissions.

It uses a wireless protocol that connects It uses a wireless protocol that connects electronic devices when they are close to electronic devices when they are close to each other.each other.

HistoryHistory

Bluetooth is managed by the Bluetooth Bluetooth is managed by the Bluetooth Special Interest Group (SIG).Special 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.

How it works?How it works? A master Bluetooth device can A master Bluetooth device can

communicate with a maximum of communicate with a maximum of seven devices in a seven devices in a piconet (an ad-hoc  (an ad-hoc computer network using Bluetooth computer network using Bluetooth technology), though not all devices technology), though not all devices reach this maximum.reach this maximum.

The devices can switch roles, by The devices can switch roles, by agreement, and the slave can agreement, and the slave can become the masterbecome the master

The connection of two or more The connection of two or more piconets form a piconets form a scatternet, in which , in which certain devices simultaneously play certain devices simultaneously play the master role in one piconet and the master role in one piconet and the slave role in another.the slave role in another.

At any given time, data can be At any given time, data can be transferred between the master and one transferred between the master and one other device.other device.

No slaves are connected to each other.No slaves are connected to each other.

The master chooses which slave device to The master chooses which slave device to address; typically, it switches rapidly address; typically, it switches rapidly from one device to another in a from one device to another in a round-robin fashion.

PairingPairing

Pairing is a bonding procedure that allows you to Pairing is a bonding procedure that allows you to avoid entering access information each time two avoid entering access information each time two devices establish a connection.devices establish a connection.

If Secure Connection is enabled, devices will pair If Secure Connection is enabled, devices will pair automatically the first time they connect (a automatically the first time they connect (a password, or passkey, must be successfully password, or passkey, must be successfully exchanged).exchanged).

When you pair two devices, they generate and When you pair two devices, they generate and store a common link key so that you do not need store a common link key so that you do not need to enter the passkey.to enter the passkey.

Wi-Fi is intended as a replacement Wi-Fi is intended as a replacement to LAN while Bluetooth is intended to LAN while Bluetooth is intended as a replacement of cabling for as a replacement of cabling for personally carried applications.personally carried applications.

Wi-Fi uses same radio frequencies as Wi-Fi uses same radio frequencies as Bluetooth but with higher Bluetooth but with higher power ,resulting in higher bit rates power ,resulting in higher bit rates when compared to Bluetooth.when compared to Bluetooth.

Bluetooth v/s Wi-FiBluetooth v/s Wi-Fi

DevicesDevices

LaptopsLaptops Gaming Gaming

ConsolesConsoles HeadsetsHeadsets Mobile PhonesMobile Phones PrintersPrinters Digital Digital

camerascameras GPS receiversGPS receivers

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 Does not needs a clear line of sight

between synced devices.between synced devices.

DisadvantagesDisadvantages Speed is comparatively less to other Speed is comparatively less to other

sharing devices.(max of 1 mbps)sharing devices.(max of 1 mbps) Since data is transferred over radio waves Since data is transferred over radio waves

using Bluetooth, it is much easier for a using Bluetooth, it is much easier for a hacker to break into than secure wireless hacker to break into than secure wireless networks. For that reason, Bluetooth networks. For that reason, Bluetooth should not be used to transfer data that should not be used to transfer data that needs to remain private and secure.needs to remain private and secure.

It considerably lowers the battery life if left It considerably lowers the battery life if left switched ON on one’s device.switched ON on one’s device.

ConclusionConclusion

Few flawsFew flaws SecuritySecurity

Good for short transfersGood for short transfers Limitations on file sizeLimitations on file size Limitations on distanceLimitations on distance

Convenient Convenient Faster Faster More simple than flash driveMore simple than flash drive

Thank you for listening !!Thank you for listening !!

Questions?Questions?