discover the world of bluetooth technology

8/10/2019 Discover the World of Bluetooth Technology

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The term Bluetooth refers to an open specification fo

technology to enable short-range wireless voice andcommunications anywhere in the world.

Bluetooth is a standard for a small, low-cost, power eradio chip that can be used by computers, printers, phones, headsets, headphones, and numerous othe

electronics. This technology allows multiple devices tcommunicate with each other or one device can comanage several other devices.


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Much in the same way that King Harald Bluetooth united DenmaNorway, Bluetooth was designed to unite computers, phone eqmany other electronics devices. Back in 1994, Ericsson MobileCommunications began a feasibility study on an inexpensive lo

radio solution between cell phones and phone accessories.

Four years later, Ericsson, along with Nokia, IBM, Toshiba and IntBluetooth Special Interest Group (SIG). This association represencompanies in mobile telephony, notebook computers and a madigital signal processing technology.


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Bluetooth takes the information normally cby a wire and transmits it at a special freqanother Bluetooth device. Both the sendin

receiving devices have what is called a Blreceiver chip, which translates data into atransmission and then back to normal agadepending on if it is sending or receiving d


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Two devices locate each other.Form a connection and transfer data.

Wireless cable replacement scenario.

The device that initiates the connection is calledMaster.

Any other devices the Master is connected to areferred to as Slaves.


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Two devices create a point-to-point connectionA third device comes into range.

The new device is discovered is added to the piand data can be transferred.

Up to seven slaves can be connected to one m

Slaves cannot pass data to other slaves withoutthrough the master.

The master defines the timing for the piconet.


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Scatternets allow devices to be active in numerpiconets.

The device can be a slave in one piconet and ain another. It cannot be a master in two piconet

The device can act as a gateway from one pic

another.


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A master can create two types of logical channa slave device:

Asynchronous Connection Less (ACL): Packet SwSystem provides a reliable data connection witheffort bandwidth; depends on radio performancnumber of devices in the piconet.

Synchronous Connection Oriented (SCO): CircuSwitched System provides real time unreliableconnection with a guaranteed bandwidth; usuafor voice based applications.


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Globally free spectrum2.45 GHz, ISM bandGFSK modulationFrequency Hopping (1600 hops/sec)Range10m piconet (0dBm)100m optional (+20dBm)

Data and voice capable (1Mbps)Full duplex: 478kbps, Asymmetric 721kbpsSecureAuthentication128 EncryptionLimited Signal range

Pseudo Random hop sequence


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The Bluetooth specification defines a series of profiles th

interoperability between similar devices. The profiles describe applications and usage scenarios f

common applications.ApplicationSerial EmulationAd-hoc Network

Dial up w/ PhoneFile transferFAXAudioPrint


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The Conference Table

Create and share information with your colleaforming small private workspace .

Collaborative work

File and resource sharing

The Instant Postcard

Send instant photos and video clips from any

Suitable for professional as well as private us


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Bluetooth does not require a clear line of sight between the sdevices. This means that the devices need not be facing eacis also possible to carry out transfers when both the devices arooms.

The fact that this technology requires no cables and wires is shas made it so popular. With so many devices engulfing our lneed for clutter-free technology is becoming more intense.

The maximum range that it offers is 100 meters, but this rangesame for all similar connections. It depends on the nature of tand the version that they operate upon.


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One major advantage is its simplicity of use. Anyone caout how to set up a connection and sync two devices w

Moreover, the technology is completely free to use andno charges to be paid to any service provider.

The processing power and battery power that it requireto operate is very low. This makes it an ideal tool for so melectronic devices, as the technology can be implemenpretty much anywhere.

The chances of other wireless networks interfering with yvery low. This is because of the low powered wireless sigthe technology adopts, and also because of somethingas frequency hopping.


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Though the transfer speeds are impressive at around 1 Mcertain other technologies like Infrared can offer speedsMbps. This is an area that can be improved on in the ne

Even though the security is good, it is even better on Infris because of the comparatively larger range of Bluetoo

also the lack of a line of sight. Someone who knows howsuch networks can do so eventually.

The battery usage during a single transfer is negligible, bare some people who leave the device switched on in tdevices. This inevitably eats into the battery of these devlowers the battery life considerably.

discover the world of bluetooth technology

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