Bluetooth

WELCOME TO THE

WORLD OF

“BLUETOOTH”

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INTRODUCTION.. The technology got its unusual name in honor of

Harald Bluetooth, king of Denmark in the mid-tenth century.

Bluetooth is a telecommunications industry specification that describes how mobile phones, computers, and personal digital assistants (PDAs) can be easily interconnected using a short-range wireless connection..

Using this technology, users of cellular phones, pagers, and personal digital assistants can buy a three-in-one phone that can double as a portable phone at home or in the office..

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INTRODUCTION.. Bluetooth requires that a low-cost

transceiver chip be included in each device. . The tranceiver transmits and receives in a

previously unused frequency band of 2.45 GHz that is available globally (with some variation of bandwidth in different countries). In addition to data, up to three voice channels are available.

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INTRODUCTION.. Each device has a unique 48-bit address from

the IEEE 802 standard. Connections can be point-to-point or multipoint.

The maximum range is 10 meters. Data can be exchanged at a rate of 1 megabit

per second (up to 2 Mbps in the second generation of the technology).

A frequency hop scheme allows devices to communicate even in areas with a great deal of electromagnetic interference. Built-in encryption and verification is provided.

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BLUETOOTH TECHNOLOGY..

The Bluetooth specification targets power consumption of the device from a "hold" mode consuming 30 micro amps to the active transmitting range of 8-30 milliamps (or less than 1/10th of a watt).

The chips also have excellent power-saving features, as they will automatically shift to a low-power mode as soon as traffic volume lessens or stops.

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BLUETOOTH TECHNOLOGY

Bluetooth devices are classified according to three different power classes, as shown in the following table

Power Class

Maximum Output

Power

1 100 mW(20

dBm)

2 2.5 mW(4

dBm)

3 1 mW(0

dBm)

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MODES OF OPERATION..

An interesting aspect of the technology is the instant formation of networks once the bluetooth devices come in range to each other. A piconet is a collection of devices connected via Bluetooth technology in an ad hoc fashion.

The Bluetooth system supports both point-to-point and point-to-multi-point connections. When a device is connected to another device it is a point to point connection. If it is connected to more that one (upto 7 ) it is a point to multipoint connection.

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MODES OF OPERATION.. A piconet starts with two connected devices,

such as a portable PC and cellular phone, and may grow to eight connected devices.

when establishing a piconet, one unit will act as a master and the other(s) as slave(s) for the duration of the piconet connection. In a piconet there is a master unit whose clock and hopping sequence are used to synchronize all other devices in the piconet.

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MODES OF OPERATION . A 3-bit MAC address is used to distinguish

between units participating in the piconet. Devices synchronized to a piconet can enter

power-saving modes called Sniff and hold mode, in which device activity is lowered.

Also there can be parked units which are synchronized but do not have a MAC addresses. These parked units have a 8 bit address, therefore there can be a maximum of 256 parked devices.

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BLUETOOTH APPLICATION

• By installing a Bluetooth network in your office you can do away with the complex and tedious task of networking between the computing devices, yet have the power of connected devices. No longer would you be bound to fixed locations where you can connect to the network. Each Bluetooth device could be connected to 200 other devices making the connection of every device with every other possible. Since it supports both point to point and point to multipoint it will virtually make the maximum number of simultaneously linked devices unlimited.

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The Bluetooth technology connects all your office peripherals wirelessly. Connect your PC or notebook to printers, scanners and faxes without the ugly and trouble some cable attachments. You can increase your freedom by connecting your mouse or the keyboard wirelessly to your computer.

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Bluetooth allows us to have three way phones. At home, your phone functions as a portable phone (fixed line charge). When you're on the move, it functions as a mobile phone (cellular charge). And when your phone comes within range of another mobile phone with built-in Bluetooth wireless technology it functions as a walkie-talkie (no telephony charge).

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If your digital cameras in Bluetooth enabled, you can send still or video images from any location to any location without the hassle of connecting your camera to the mobile phone on the wireline phone.

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Automatic Message Delivery: Compose e-mails on your portable PC while you're on an airplane. As soon as you've landed and switched on your mobile phone, all messages are immediately sent.

Upon arriving at your home, the door automatically unlocks for you, the entry way lights come on, and the heat is adjusted to your pre-set preferences.

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Some product demonstrations during

2000 The Ericsson Bluetooth Headset is a lightweight,

wireless mobile phone headset, with a built-in Bluetooth radio chip that acts as a connector between the headset and the Bluetooth plug on the Ericsson phone. When your phone rings, you can answer by simply pressing a key on the headset. If you want to make a call, press the key on the headset and use voice recognition to initiate the call. The phone can be up to 10 meters (30 ft.) away, in a briefcase, your coat pocket, or even in another room while you speak and enjoy complete mobility without cables

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dangling about. Weighing a mere 20 grams (0.75 oz.), the Bluetooth Headset sits comfortably on either ear and can be used with Ericsson T28, T28 WORLD and R320 cellular phones.

Nokia displayed a Bluetooth headset that allows users wireless communication with their mobile phones over distances of up to 10 metres.

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Nokia and Fujifilm have been developing a prototype Mobile Imaging technology, allowing a modified Nokia 9110 Communicator containing a Bluetooth chip to receive images taken on a Bluetooth equipped Fujifilm digital camera. After adding a few lines of text, the user can send the received photograph to another Nokia Communicator, or to the Fujifilm Web service, where it could be viewed, printed or saved on a CD-R. By combining the ease of SMS messaging with digital photography, Mobile Imaging is a clear indication of the potential of Bluetooth.

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Some Bluetooth enabled products in the market:

Ericsson R520 Bluetooth/WAP/GPRS/Triband

Ericsson T36 Bluetooth/WAP/HSCSD/Triband

Bluetooth-enabled Nokia 9110 linked to a FujiFilm digital camera

Ericsson Bluetooth GSM Headset Ericsson Communicator

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BLUETOOTH PROFILES In order to use Bluetooth,a device must be able to interpret

certain Bluetooth profiles.These define the possible applications.Following profiles are defined:

Generic Access Profile(GAP) Service Discovery Application Profile(SDAP) Cordless Telephony Profile(CTP) Intercom Profile(IP) Serial Port Profile(SPP) Headset Profile(HP) Dial-up Networking Profile(DUNP)

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LAN Access Profile(LAP) Fax Profile Generic Object Exchange Profile(GOEP) Object Push Profile(OPP) File Transfer Profile(FTP) Synchronisation Profile(SP) It has been adopted by Bluetooth SIG to form a

part of the main Bluetooth specification ,it is also commonly referred to as IrMC Synchronization

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ADVANTAGES OF BLUETOOTH :

One of the biggest advantages to come up with this technology is the disapperance of cables and cable attachments.

Connections between devices are instant and maintained even when devices are not within the line of sight.

The project lower cost of bluetooth chip &its lower power consumption makes it possible to be placing it anywhere.

As long as the devices are within a range of 10m(32 feet),they can easily communicate with each other no matter where they are placed,even if

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they are in different rooms the walls of the rooms can’t stand as an obstacle for their communication.

THOUGH BLUETOOTH IS STILL IN ITS INFANCY,THIS

LOW COST WIRELESS COMMUNICATION

TECHNOLOGY FOR SHORT RANGES HAS THE

POTENTIAL TO CHANGE THE WAY WE THINK AND

LIVE.