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Bluetooth Report

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					                            BLUETOOTH

INTRODUCTION
Bluetooth wireless technology is a short-range communications technology intended to replace
the cables connecting portable and/or fixed devices while maintaining high levels of security.


Bluetooth is widely used and operates on a frequency of 2.402-2.480GHZ. It is used in Mobile
Phones and Computers. The range is only 10 metres and can go through walls as it doesn’t need
to be in the line of sight of the second item. You can also get Bluetooth 2.0 which runs on
exactly the same frequencies but it’s a faster transfer rate. The transfer rate is approximately
80kb per second on Bluetooth 2.0 and about half on Bluetooth 1.1.
Bluetooth provides a secure way to connect and exchange information between devices such as
faxes, Mobile phones, laptop and personal computers.




Uses
Bluetooth is a standard communications protocol primarily designed for low power consumption,
with a short range (power-class-dependent: 100 m, 10 m and 1 m, but ranges vary in practice; see
table below) based on low-cost transceiver microchips in each device. Because the devices use a
radio (broadcast) communications system, they do not have to be in line of sight of each other.

        Maximum Permitted Power Range
Class
        mW        dBm           (approximate)
Class 1 100       20            ~100 meters
Class 2 2.5       4             ~10 meters
Class 3 1         0             ~1 meters

In most cases the effective range of class 2 devices is extended if they connect to a class 1
transceiver, compared to a pure class 2 network. This is accomplished by the higher sensitivity
and transmission power of Class 1 devices.
Version                             Data Rate
Version 1.2                                     1 Mbit/s
Version 2.0 + EDR                               3 Mbit/s
Version 3.0 + HS                                24 Mbit/s

While the Bluetooth Core Specification does mandate minimums for range, the range of the
technology is application specific and is not limited. Manufacturers may tune their
implementations to the range needed to support individual use cases.



Infrared
Data goes through radiation. You have to be in its line of site. It is slow and runs on the 2.4ghz
frequency.


Wi-Fi
Wi-Fi is the most widely used for Wireless internet, it runs 802.11 standard on 2.4ghz frequency.
It comes as 802.11a. b. g. i and n. the later the letter /
Licensed Frequencies are frequencies which are allowed to be used. Such as radio stations and
TV stations. These are fully legal and are registered with countries to be used.




Unlicensed Frequencies
Unlicensed Frequencies are frequencies which are only allowed to be used for legal purposes
only. Wi-Fi used on the 2.4ghz frequency is unlicensed but can be used as long as its not being
used illegally.
Wireless network access points
Wireless network access points are places where you can connect to the internet with a mobile
device such as a PDA or Laptop. These can be found in town centres. Normally you have to pay
for these but towns and cities are starting to bring free ones in for anyone to use at a capped
speed.



Hardware for setting up a wireless network at home
To set up a wireless network at home you firstly need an internet modem. You can connect a
wireless router to this and share the connection via cables or wireless. For wireless you also need
all the PC's to have wireless connectivity which can be an internal PCI Wireless network card or
a USB Wireless dongle.


Encryption
Encryption is used so your wireless internet connection cant be used by others. The encryption
codes that are used are ASCII2 and Hexdecimal. These are used in forms like WEP. WEP is a
type of protection code.



Bluetooth and Wi-Fi Comparison


Bluetooth                              Wi-Fi

Fast but short range                   Long and fast speeds

Connectivity in more places            Mainly in homes and businesses

Low security                           Can be High Security

In Mobile Phones                       In Computers

Good for sending small files           Good for sending lots of data

				
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