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BLUETOOTH
INTRODUCTION
Bluetooth is a wireless technology that allows computers, phones and other devices
to talk to each other over short distances (up to 100 meters). Bluetooth uses radio waves (inthe 2.4 Gigahertz range), and is designed to be a secure and inexpensive way of connecting
and exchanging information between devices without wires.
You'll find Bluetooth in many of the newer mobile phones, handheld computers, laptops,
printers, handheld organizers, as well as in all sorts of products.
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BASIC USES OF BLUETOOTH
sending photos from your mobile
exchanging business cards
sending voice from a headset to a mobile phone and real-time satellite navigation using GPS [The Global Positioning
System (GPS) is a space-based global navigation satellite
system that provides reliable location and time information in all
weather and at all times and anywhere on or near the Earth.]
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USING BLUETOOTH
Here's an example of some of the things you can do with
Bluetooth:
Transfer files (such as mp3s and photos) to and from your mobile
A wire-free headset for your mobile
Backup your PDA or mobile to your PC
Use a Bluetooth GPS device for satellite navigation on your mobile phone, PDA orlaptop.
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BLUETOOTH PRODUCTS
MOBILE HANDSET HANDHELD PDA PHONE HEADSET USB DONGLES
AND ADAPTERS
GPS NAVIGATION MODEM/ACCESS POINT PRINTER/PRINT ADAPTER
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WIRELESS LAN
INTRODUCTION
A wireless local area network (WLAN) links two or more devices
using some wireless distribution method, and usually providing a
connection through an access point to the wider internet. This gives
users the mobility to move around within a local coverage area andstill be connected to the network.
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WLAN TYPES
The private home or small business WLANCommonly, a home or business WLAN employs one or two access points to broadcast
signal around a 100- to 200-foot radius.
The enterprise class WLANThis type employs a large number of individual access points to broadcast the signal to a
wide area.
Wireless WAN (wide area network)
WANs used to exist in order to connect LANs in different geographical areas.Now, cellular phone companies offer WWAN technology that the end user can
access directly.
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ADVANTAGES OF WIRELESS LAN
Easy set-up
Easy access
More users of the same
network
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Reasons to choose wireless networking over
traditional wired networks include:
- Easy set up-Flexibility of location and data ports is required
-Roaming capability
Network access is desired outdoors; e.g., outside a home or office
building
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Wi-Fi
INTRODUCTION Wi-Fiis the industry name for wireless LAN (WLAN) communication
technology . Wi-Fi is a particular type of wireless local area network
(WLAN) - i.e. it is not necessary to plug a computer into a phone network
via a cable. There are many types of WLAN but all of them allow two or more
computers to form a network using radio frequency (RF) signals.
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DISADVANTAGES OF USING Wi-Fi
Password and Security
Signal Strength Sensitivity
Effect of Climatic Conditions
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IsBluetooth the sameasWi-Fi?
Bluetooth isnottobemistaken for Wi-Fi (wirelessnetworking) - Bluetoothrunsatalower
speed and powerthan Wi-Fi.
IsBluetooth& Wi-FiCompatable?
Bluetooth and Wi-Fi arebothradiotechnologies, butthey differin the frequenciesand
protocolsthatthey use. They don'tinterferewitheachother, butthetwodon'ttalk toeachothereither- in other wordsyoucan'tgetadevicewithBluetoothtocommunicate
toadevicethatonly supportsWi-Fi.
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'Infrared' (IR) light is electromagnetic radiationwith awavelength
between0.7 and300 micrometres, which equates to afrequency rangebetweenapproximately 1 and430 THz.
IR wavelengths are longer than that ofvisible light, but shorterthan that
ofterahertz radiationmicrowaves. Bright sunlight provides an irradiance
ofjust over1 kilowatt persquaremeterat sea level. Ofthis energy, 527
watts is infraredradiation, 445 watts is visible light, and32 watts isultraviolet radiation.
DEFINITION
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Infrared is used in night vision equipment when there is insufficient
visible light to see. Night vision devices operate through a process
involving the conversion of ambient light photons into electrons
which are then amplified by a chemical and electrical process andthen converted back into visible light. Infrared light sources can be
used to augment the available ambient light for conversion by
night vision devices, increasing in-the-dark visibility without
actually using a visible light source.
The use of infrared light and night vision devices should not be
confused with thermal imaging which creates images based ondifferences in surface temperature by detecting infrared radiation
(heat) that emanates from objects and their surrounding
environment.
Night Vision
Active-infrared night vision : the camera
illuminates the scene at infrared wavelengths
invisible to the human eye. Despite a dark
back-lit scene, active-infrared night vision
delivers identifying details, as seen on the
display monitor.
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The Earth's surface and the clouds absorb visible and invisible
radiation from the sun and re-emit much of the energy as infrared
back to the atmosphere. Certain substances in the atmosphere,chiefly cloud droplets and water vapor, but also carbon dioxide,
methane, nitrous oxide, sulfur hexafluoride, and
chlorofluorocarbons,absorb this infrared, and re-radiate it in all
directions including back to Earth. Thus the greenhouse effectkeeps the atmosphere and surface much warmer than if the
infrared absorbers were absent from the atmosphere.
The Earth as an infrared emitter
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PRESENTATION DONE BY :
GIRISHROHRA
38
DHWANIL SHROFF
54
VIDUR SURI55
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