1. Emilia Nisha D’souza [1741116]
Computer Networks By
Emilia Nisha D’souza [ ]
Madhavan Mohan [ ]
Yashaswani Agarwal [ ]

2. A standard for the short-range wireless interconnection of mobile phones, computers, and other electronic devices.
It is an ad hoc network
It can not be large. If there are many gadgets that try to connect, there is chaos
yash

3. BLUETOOTH DEVICES
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4. BLUETOOTH PROFILES
A Bluetooth profile is a specification regarding an aspect of Bluetooth-based wireless communication between devices. The way a device uses Bluetooth technology depends on its profile capabilities. The profiles provide standards which manufacturers follow to allow devices to use Bluetooth in the intended manner.
Generic
Building Block
Networking
Telephony
Object Exchange
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5. Generic
Generic Access – This profile defines the generic procedures related to discovery of Bluetooth devices (idle mode procedures) and link management aspects of connecting to Bluetooth devices (connecting mode procedures). It also defines procedures related to use of different security levels.
Service Discovery – This profile defines the features and procedures for an application in a Bluetooth device to discover services registered in other Bluetooth devices and retrieve any desired available information.
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6. Building Block
Serial Port – Essentially, the Serial Port Profile defines the protocols and procedures that shall be used by devices using Bluetooth for RS232 (or similar) serial cable emulation. The scenario covered by this profile deals with legacy applications using Bluetooth as a cable replacement, through a virtual serial port abstraction (which in itself is operating system-dependent).
Generic Object Exchange – It defines a client – server relationship for object movement and building block for other profiles
emi

7. Networking
Lan Access – Allows a Bluetooth device to connect to a fixed network
Dial up Networking – It allows a notebook computer to connect to a mobile phone containing a built – in modem without wires.
Fax – It allows wireless fax machines to send and receives faxes.
emi

8. Telephony
Cordless Telephony Profile - CTP allows a Bluetooth-enabled cell phone to be used as a cordless telephone when it is within range of a Bluetooth CTP access point. CTP is thus a way of adding limited mobility – cordlessness – to the fixed network.
Intercom Profile - As the intercom usage is completely symmetrical, there are no specific roles defined. A device supporting the Intercom profile will generally be denoted as Terminal . Example: Two (cellular) phone users engaged in a speech call, on a direct phone-to-phone connection using Bluetooth only. Allows two telephones to connect as walkie-talkies.
Headset Profile - The Headset Profile defines a simple audio connection between a Bluetooth audio gateway, like a cell phone, and a headset.
Example – while driving a car
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9. Object Exchange
Object Push – Provides a way to exchange simple objects.
File Transfer – provides a more general file transfer facility
Synchronization Profile – This profile defines the requirements for the protocols and procedures that shall be used by the applications providing the synchronization usage model
yash

10. RADIO LEVEL
The radio layer is roughly equivalent to the physical layer of the Internet model. Bluetooth devices are low-power and have a range of 10 m.
Band
Bluetooth uses a 2.4-GHz ISM band divided into 79 channels of 1 MHz each.
FHSS
Bluetooth uses the frequency-hopping spread spectrum (FHSS) method in the physical layer to avoid interference from other devices or other networks. Bluetooth hops 1600 times per second, which means that each device changes its modulation frequency 1600 times per second. A device uses a frequency for only 625 μs (1/1600 s) before it hops to another frequency; the dwell time is 625 μs.
Maddy

11. Modulation To transform bits to a signal, Bluetooth uses a sophisticated version of FSK, called GFSK (FSK with Gaussian bandwidth filtering; a discussion of this topic is beyond the scope of this book). GFSK has a carrier frequency. Bit 1 is represented by a frequency deviation above the carrier; bit 0 is represented by a frequency deviation below the carrier. The frequencies, in megahertz, are defined according to the following formula for each channel. Fc = n MHz n =0, 1, 2, 3, . . ., 78 For example, the first channel uses carrier frequency 2402 MHz (2.402 GHz), and the second channel uses carrier frequency 2403 MHz (2.403 GHz).

12. IMPORTANT QUESTION Q. Explain in brief about Bluetooth architecture and give examples of some Bluetooth devices.

13. Thank You