All about wifi

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2. Does anyone know what is wifi??

3. What is Wi-Fi
 Wi-Fi is short for wireless fidelity. It refers to a local
area network which uses high frequency radio signals
to send and receive data over short distances.
 A wireless network uses radio waves, just like cell
phones, televisions and radios do. In
fact, communication across a wireless network is a lot
like two-way radio communication. Here's what
happens

4. History of
Wi-Fi

5. Wifi overview
 Wi-Fi was invented in 1991.
 Wi-Fi was invented by NCR Corporation/AT&T.
 Vic Hayes is known as the father of Wi-Fi for his
invention While working for Agere systems.
 Agere Systems suffered from strong competition
soon after Vic quit.

7. How does it works?
WI-FI SYSTEM
Consists of 4 main parts:
a) High speed access – broadband – internet connection or
transmitter.
b) Network Gateway - between the high speed access connection
and the wireless network. – prevents unknown users from
accessing the Wi-Fi. Acts like a gate security.
c) Wireless local area network - connects PC or any device to the
broadband and establish internet connection.
d) Wireless Customer – Internet users that have device that can
access internet.

8.  Wi-Fi transmit radio waves through antenna and
routers.
 Radio waves received by wireless adapter installed in
laptops, Smartphones etc.
 As long as it’s within the Wi-Fi coverage area.

10.  To consider employing other measures to secure your
communications after they travel beyond your Wi-Fi
network.
 Using WPA2 provides both security and privacy for
communications.
 Wi-Fi Protected Access 2 (WPA2) is the final version of
WPA agreed on by the Wi-Fi Alliance.
 WPA is a security protocol designed to create secure
wireless (Wi-Fi) networks. It is similar to the WEP
protocol, but offers improvements in the way it
handles security keys and the way users are
authorized.

11. WPA2 can be implemented in two versions:
 WPA2-Personal - developed for home and small
office use
 WPA2-Enterprise - developed for large businesses

13. Wifi direct:
 Allows Wi-Fi devices to connect to each other without the need
for a wireless access point.
When use?
 When you share your content, synch your data, socialize, play
games, play audio and video, and more.
How it work?
 Wi-Fi Direct device will signal to other devices in the area that it
can make a connection.
 You can view available devices and ask them to connect, or you
might receive an invitation to connect to another Wi-Fi Direct
device.
 When Wi-Fi Direct-certified devices connect directly, data will
transfer after accept another Wi-Fi Direct device.

14. Wi-Fi hotspots provide wireless Internet access within public areas
The internet speed of wireless network is depending on many factor:
The size and configuration of the hotspot.
The number of the concurrent users.
What the user are doing on the
network.

15. Benefit of hosting a hotspot
 Attract people to your place.
 Generate additional revenue.
 Create a private network for your own use.
Setting up the
hotspot
Step 1: Gather Step 3: Configure
Step 2: Set up the
the necessary additional
wireless router.
item. settings.

16.  The wireless router should be as close as possible to the hotspot's
intended coverage area and preferably in the middle.
Filter Hotspot Content
There are few filtering methods to keep the users safer in using the Wi-Fi hotspot:
•Filter web content such as block pornography.
•Block certain Internet ports to prevent the use of file sharing program and email
•Block specific websites.
•Block websites based on keywords.

18. 2nd Generation Technology 2G
 2G comes with GPRS (General Packet Radio Services)
technology.
 Provide data rates from 56kbit/s up to 115kbits.
 Wireless Application Protocol (WAP) access
 Multimedia Messaging Service (MMS)
 Internet communication services such as email and
world wide web

19. 3rd Generation Technology 3G
 Offer users a wider range of more advance services
with greater network capacity.
 Wireless voice telephony,
 Video calls,
 Broadband wireless data in a mobile environment.
 Other services for 3G
 High Speed Package Access (HSPA) with with speed
14.4Mbit/s downlink and 5.8Mbit/s uplink
 GPS (Global Positioning System)
 Video Conferencing

20.  3G has the following enhancements over 2G and
previous network:
 Enhanced audio and video streaming
 Several times higher data speed
 Video-conferencing support
 Web and WAP browsing at higher speed
 IPTZ (TV through the internet) support.

21. 4th Generation Technology 4G
 4G refer to cellular wireless standards.
 It is extension in the 3G technology with more
bandwidth and services offers.
 4Gtechnologys is basically the high quality
audio/video streaming over end-to-end internet
protocol.

23. Home
Small Businesses or SOHO
Large Corporations & Campuses
Health Care
Wireless ISP (WISP)
Travellers

24. Absence of wires.
The network is based on wireless Wi-Fi technology which does not
require using the telephone or any other lines of connection based
on wires.
New horizons.
First of all is mobility. Your are not tied up to your working place
any more still having connection with based, e-mail, colleagues
and friends.
Possibility of some mobility.
Since you are not tied up to wires, you can easily change
location of your computer not worrying about connection
withdrawal (in the cover area of access point).
High-speed access to internet.
A high-speed access to internet is offered for network subscribers,
speed of channel is 108Mbit/sec. Meanwhile, there is no necessity
for ringing up or connection defining, etc. You are always on-line
and to be connected to internet it is just enough to open your
browser.
Any kind of intranet information exchange.
Your intranet communication is no how limited and you can send any files,
communicate in chat, play network games, etc.

25. Interference.
Because your Wi-Fi equipment uses radio waves (probably in the 2.4 GHz frequency band), it can
be vulnerable to interference from household devices like microwaves and cordless phones. Your
neighbor's wireless network can also be a source of interference.
Updating your older computer.
If your computer isn't equipped for Wi-Fi, you will have to buy and install a Wi-Fi card that's
compatible with your PC. Or, if your computer has an older 802.11b card, you may want to update
it to work with your faster 802.11g network. In either case, you can expect to spend up to $100 for a
new card.
Privacy concerns.
You may be wondering whether information you transmit from your laptop wirelessly can be
intercepted. That's possible, and it's also possible for hackers to use your access point to connect
to the Internet.