What is Wi-Fi?What is Wi-Fi?

Wi-Fi, or Wireless Fidelity, is freedomWi-Fi, or Wireless Fidelity, is freedom Allows us to connect to the Internet from Allows us to connect to the Internet from

anywhere without wires. anywhere without wires. Send and receive data indoors and out; Send and receive data indoors and out;

anywhere within the range of a base anywhere within the range of a base station. station.

Fast. Fast.

Wi-Fi HotspotWi-Fi Hotspot

A region, covered by Wi-Fi.A region, covered by Wi-Fi. Any location in which wireless technology Any location in which wireless technology

available for use to consumers. available for use to consumers. Airports, coffee shops, and so on.Airports, coffee shops, and so on.

Wi-Fi Connects You AnywhereWi-Fi Connects You Anywhere

Connects you to others and to the Internet. Connects you to others and to the Internet. Gives freedom to change locations - and to Gives freedom to change locations - and to

have full access to your files, office and have full access to your files, office and network connections wherever you are. network connections wherever you are.

TYPES OF WI-FlTYPES OF WI-Fl

IEEE 802.llb - the ‘B’ standardIEEE 802.llb - the ‘B’ standard IEEE 802.lla - WI-Fi 5IEEE 802.lla - WI-Fi 5 IEEE 802.llg -the ‘G’ standard IEEE 802.llg -the ‘G’ standard

IEEE 802.llb - the ‘B’ standardIEEE 802.llb - the ‘B’ standard

802.ll b protocols began appearing in the 802.ll b protocols began appearing in the marketplace in late 1999. marketplace in late 1999.

Operates in the 2.4 GHz radio spectrum, which Operates in the 2.4 GHz radio spectrum, which is also shared with devices such as cordless is also shared with devices such as cordless phones and microwave ovens. phones and microwave ovens.

802.llb will operate within a 100- 150 feet 802.llb will operate within a 100- 150 feet range. range.

Theoretical maximum transfer speed is 11MbpsTheoretical maximum transfer speed is 11Mbps The a dual real world performance is about 4- The a dual real world performance is about 4-

6Mbps6Mbps

IEEE 802.lla - WI-FI 5IEEE 802.lla - WI-FI 5

Theoretical maximum speed of 54 Mbps.Theoretical maximum speed of 54 Mbps. The actual real-world performance of ‘A’ The actual real-world performance of ‘A’

is 15- 20 Mbps, or about four times faster is 15- 20 Mbps, or about four times faster than 802.llb. than 802.llb.

It operates in the5 GHz bandIt operates in the5 GHz band Performs better in high density areas. Performs better in high density areas. A technology features more non-A technology features more non-

overlapping channelsoverlapping channels

IEEE 802.llg -the ‘G’ standardIEEE 802.llg -the ‘G’ standard

Introduced in 2003Introduced in 2003 Combines many of the best features of the Combines many of the best features of the

previous two standards. previous two standards. (B) Working distance of 100- 150 feet. (B) Working distance of 100- 150 feet. The G standard uses 2.4 GHz radio The G standard uses 2.4 GHz radio

frequencies.frequencies. (A) Shares the advantage of extremely fast (A) Shares the advantage of extremely fast

data throughput. data throughput. Speeds of 15 - 20 MbpsSpeeds of 15 - 20 Mbps

Connecting Two PCs Using an Access Connecting Two PCs Using an Access

PointPoint connect the RJ45 cable to connect the RJ45 cable to

the NIC.the NIC. Connect the other side to Connect the other side to

the LAN port of the the LAN port of the Access Point.Access Point.

Get the LAN on the same Get the LAN on the same IP range as the Access IP range as the Access Point Point

Ping.Ping. Access the web server of Access the web server of

the Access Point.the Access Point.

Plugged in the PCI Plugged in the PCI wireless card. wireless card.

Let the card get detected by Let the card get detected by the System. the System.

Go to ‘Wireless Network Go to ‘Wireless Network Connections’ properties.Connections’ properties.

Scroll down to the ‘TCP/IP Scroll down to the ‘TCP/IP connection’ properties. connection’ properties.

Assign an IP to the Assign an IP to the wireless card with the first wireless card with the first three metrics. three metrics.

Connecting Two PCs using a Wireless Connecting Two PCs using a Wireless

RouterRouter Wireless routers are Access Points that have the Internet Wireless routers are Access Points that have the Internet

port for a DSL or cable modem connection, and in most port for a DSL or cable modem connection, and in most cases, also has a 4-port switch. Here is how you will have to cases, also has a 4-port switch. Here is how you will have to go about getting it running.go about getting it running.

Connect a RJ45 cable to the Internet port of the router.Connect a RJ45 cable to the Internet port of the router. Observe whether all the LEDs are behaving properly.Observe whether all the LEDs are behaving properly. On the first system, wireless card plugged in. On the first system, wireless card plugged in. Get the wireless Card on the same IP range as the router is.Get the wireless Card on the same IP range as the router is. Once router is detected by the wireless card, launch your Once router is detected by the wireless card, launch your

browser and Type in “http://<IP address of router>”.browser and Type in “http://<IP address of router>”. This will launch the configuration utility of the router.This will launch the configuration utility of the router.

Sharing An Internet Connection Using A Sharing An Internet Connection Using A

Wireless RouterWireless Router

Need some information handy like PPPoE, user name and Need some information handy like PPPoE, user name and password which is provided by the ISP, subnet mask, password which is provided by the ISP, subnet mask, default gateway, and so on.default gateway, and so on.

When you log in to the Web server of the router, you will When you log in to the Web server of the router, you will be asked to give this information. be asked to give this information.

Sharing An Internet Connection Using An Sharing An Internet Connection Using An

Access PointAccess Point Need third party software to share internet.Need third party software to share internet. For the setup, leave ‘Use Single NIC mode’ option For the setup, leave ‘Use Single NIC mode’ option

unchecked. unchecked. SyGate will show the appropriate connections in ‘Direct SyGate will show the appropriate connections in ‘Direct

Internet /ISP Connections’, as well as ‘1’ In ‘Local Area Internet /ISP Connections’, as well as ‘1’ In ‘Local Area Network Connection’. Network Connection’.

The ‘Direct Internet/ISP Connection would have a ‘Local The ‘Direct Internet/ISP Connection would have a ‘Local Area Network Connection’ if you have more than one LAN Area Network Connection’ if you have more than one LAN card or dial-up connection. card or dial-up connection.

To share a dial-up connection, you would first have to set up To share a dial-up connection, you would first have to set up one in Windows, and then add it in SyGate.one in Windows, and then add it in SyGate.

Now select the LAN card that connects your PC to the Access Now select the LAN card that connects your PC to the Access Point in ‘1’ within ‘Local Area Network Connection’.Point in ‘1’ within ‘Local Area Network Connection’.

Comparison with Comparison with Bluetooth TechnologyBluetooth Technology

Bluetooth:-Bluetooth:- short-range wireless connection. short-range wireless connection. Benefits:-Benefits:- (1)Wireless(1)Wireless

(2) inexpensive(2) inexpensive (3) Not require to do anything to make it work. (3) Not require to do anything to make it work.

Operate in the 2.45 Gigahertz frequency range. Operate in the 2.45 Gigahertz frequency range. Low power limits the range to about 10 meters. Low power limits the range to about 10 meters. Each device is assigned a unique 48-bit address. Each device is assigned a unique 48-bit address. Connections can be point-to-point or multipoint. Connections can be point-to-point or multipoint. Maximum transmission rate of only 1 MbpsMaximum transmission rate of only 1 Mbps

Wi-Fi:-Wi-Fi:-

• Data transmission rates approaching 54Mbps. Data transmission rates approaching 54Mbps. • Operates in the 2.4 GHz band. Operates in the 2.4 GHz band. • Transmit data at distances of well over 100 feet. Transmit data at distances of well over 100 feet. • Strong security protocolsStrong security protocols• Bluetooth products make it easy to connect various electronic Bluetooth products make it easy to connect various electronic devices to each other without the need for clumsy cables, while devices to each other without the need for clumsy cables, while 802.11-based Wi-Fi products were designed as a replacement for 802.11-based Wi-Fi products were designed as a replacement for the wired LAN.the wired LAN.

AdvantagesAdvantages

Uses an unlicensed bit of the broadcast Uses an unlicensed bit of the broadcast spectrum. spectrum.

Allows a dynamic network to be grown.Allows a dynamic network to be grown. More Reliable & Bug free Wi-Fi products. More Reliable & Bug free Wi-Fi products. Lowered prices Lowered prices Possible to move about without breaking Possible to move about without breaking

the network connectionthe network connection

DisadvantagesDisadvantages

A degradation in performance. A degradation in performance. Power consumption is high. Power consumption is high. Uses WEP protocol for protection. Uses WEP protocol for protection. Limited range.. Limited range..

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