MAIN FEATURES: WI-FI TECHNOLOGY:-ADVANTAGES AND DISADVANTAGES:

MAIN FEATURES:

WI-FI TECHNOLOGY:-
o Wi-Fi networks operate in the unlicensed 2.4 and 5 GHz radio bands, with an 11 Mbps (802.11b) or 54 Mbps 9802.11a) or 100Mbps (802.11g) data rate or with products that contain both bands (dual band), so they can provide real-world performance similar to the basic 10BaseT wired Ethernet networks used in many offices.
o Modulation used in 802.11 has historically been phase-shift keying (PSK). The modulation method selected for 802.11b is known as complementary code keying or CCK, which makes possible high data speed and is less susceptible to multipath-propagation interference.
o It's powerful.
o Wi-Fi networks use radio technologies called IEEE 802.11b, IEEE 802.11b and IEEE 802.11g to provide reliable, fast wireless connectivity.
o A Wi-Fi network can be used to connect computers to each other, to the Internet, and to wired networks (which use IEEE 802.3 or Ethernet)

ADVANTAGES:

WI-FI TECHNOLOGY:-

Wi-Fi is cheap and fast. It's cheap, compared to 3G. It's already here and its nearterm rollout appears more widespread than 3G will be.
its standards based (IEEE 802.11b); therefore, consumers are not tied to proprietary technology. Since Wi-Fi is not based on proprietary technology, it ideally should allow many companies to enter the market and competitively hasten its evolution. Also, the standard has been improved. IEEE 802.11g, which operates at 100 Mbps.
vendors are backing Wi-Fi. Intel is one of the biggest proponents of Wi-Fi. It has recently unveiled a notebook chip called Banias that is to be the heart of a mobile brand called "Centrino." This chip is designed specifically for wireless computers to enable a longer battery life and to meet the heat/thermal requirements of the notebook and handheld markets. Other major players eager to step into the market include, a joint venture of AT&T, IBM, Intel (again), and others.

DISADVANTAGES:

WI-FI TECHNOLOGY:-
o Wi-Fi transmissions can be ruined by Bluetooth transmissions, since Bluetooth hops faster than Wi-Fi.
o It consumes lot of power so it cant be used efficiently for mobile devices.
o It’s expensive.
o It’s not very secure.
o Opponents of the technology argue correctly that Internet service can be affected by the user's proximity to the access point, the number of people using it, the speed of the server, interference from cordless phones and microwaves, and the user's surroundings (i.e., radio signals are not high powered and cannot travel through metal, water, or other dense materials). All of these factors can cloud Wi-Fi's wireless allure somewhat.
o You might be wondering where 3G fits into the Wi-Fi picture. Ultimately, the two may complement each other. Wi-Fi and 3G also may not even vie for the same pool of users.
o In theory, business travelers could use Wi-Fi to access the Internet when they are stationary, e.g., waiting for a flight in an airport, and 3G when they are in motion, e.g., commuting home from work on the train. However, this scenario must overcome some hurdles before it is realized. Currently, devices cannot alternate between Wi-Fi and 3G service, and it is uncertain when this issue will be addressed.

Wi-Fi

The 802 .11b standard was developed at the end of 1990’s and finally approved at the beginning of 1999. The first data transmission devices based on the standard were launched in 2000. Wi-Fi devices were designed for corporate clients to replace traditional cable networks. A wire network required a thorough design of the network topology and manual laying of hundreds of meters of cable, sometimes in the most unexpected places. Whereas all it takes to organize a wireless network is to install several base stations at one or several spots in the office (a central receiver and transmitter with an antenna connected to an outside network or a server) and insert a network card with an antenna. After that, both people and computers can be moved freely, and even changing offices wouldn’t damage the network. In the United States, a company had offered in December 2003 to make the whole of San Francisco Wi-Fi. In Spain, Telephonic launched the services ADSL Wi-Fi, which has led it to sign various agreements with public centers, like hotels or convention centers, to install access points. The operator has created almost 400 hotstops. Some educational institutes offering Wi-Fi are Pathways World School, Guraon while most IITs and IIMs, Anna University, Annamalai University, and International School of Business (ISB) in Hyderabad, Mount Zion College of Engineering and Technology have also become hotspots.

HOW BLUETOOTH WORKS:- SYSTEM SUPPORT:-

The easiest way to enable Bluetooth
support in a system is to attach Bluetooth USB
sticks. Some motherboards, such as MSI KT3
Ultra2-BR, come with inbuilt Bluetooth support.
Once plugged into the system, you’ll have to
install the drivers for the device to start using it.
The system will then periodically scan the
surroundings for Bluetooth devices.
PROS:-
Currently Bluetooth offers the best
solution for hassle-free communication between
portable devices. With low power consumption
and user friendliness, Bluetooth has all the
requirements of a personal area network. Those
who need to transfer data on a regular basis and
prefer portable device should definably opt for
Bluetooth.
CONS:-
In spite of promises that Bluetooth
support will be cheap, consumers avoid this due
to the cost. A Bluetooth USB sticks costs about
Rs 2,000, which may be on the higher side of
main stream customers. The cost is expected to
come down to Rs 250. Don’t think this
technology as a LAN replacement, though.
DEVICE USING BLUETOOTH:-
Bluetooth is slowly beginning to reach
the hands of consumers. Most premium-range
mobiles and PDAs support Bluetooth; it has
started appering in the main stream range as
well. Users buying mobiles phones, or PDAs
should look for Bluetooth enable devices .Using
Bluetooth, you can transfer contacts, ring tones,
images etc., between devices easily.

BLUETOOTH SETTINGS AND CONFIGURATION:

To customize the configuration settings of Bluetooth software for Windows operating system, follow the instructions described below:
1. Right click on the Bluetooth icon on the righthand side of the task bar of your screen. The “Bluetooth Configuration” window appears to allow you to customize the configuration settings of “Explore”, “Setup”, or “Services”. In the “Setup” menu, there are two extended items, “Security” and “Configuration”.
2. Click on “Configuration”.
a) The “General” tab of “Configuration” allows you to customize the device’s user name, type, and security type.
b) The “Accessibility” tab allows you to specify which individual devices are allowed to access the user’s computer.
c) The “Discovery” tab allows you to specify which individual devices, type of, or class of device the user’s computer is allowed access to.
d) The “Information Exchange” tab allows you to specify the location of different types of files.
e) The “Local Services” tab indicates the services this computer makes available to the other computers.
f) The “Client Applications” tab indicates the properties of each application.
g) The “Hardware” tab indicates device information of the user’s hardware.
h) The “Version Info” tab indicates the module version of the user’s software component.
i) The “Notifications” tab lets you associate a sound (Windows *.wav file) with specific Bluetooth events.