The Internet is an international Network of Computers
Post on 23-Feb-2016
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The Internet is an international Network of Computers
USES OF INTERNET
Communicate with people all around the
world.
On line Booking of Flights
Buy and sell products/pay on-line.
Source of entertainment
take any course of your choice and
register for online certification exams
Search for information
on any specific topic
To connect to the Internet….
You need the ff.•computing device,• connection device, •Internet Service Provider (ISP).
The computing device
• can be a personal computer, a portable computer, or even a mobile device, such as a cell phone or a handheld device.
A connection device,• such as a modem, to connect your
computer to the Internet. • A modem converts digital
information into analog information and transmits it over a phone line.• A modem can either be built-in
your computer, or externally attached to it.
3gp.exe
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The ModemModem converts digital signals to analog signals and vice-versa in a process called modulation-demodulation.
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MODEM
Digital signal• Binary code Alphabet Letter:
UPERCASE • 01000001 A • 01000010 B • 01000011 C • 01000100 D• 01000101 E
An ISP is a company• that provides Internet connectivity
to individuals, businesses, and organizations.• It may also provide additional
services such as the storage space to share your personal content.
Different methods by which you can connect to the
Internet.
•by using wireless technology
•by using cables, the connection is called a physical connection.
•Bandwidth is the amount of data that can be transmitted over a network in a certain amount of time.
is measured in
•Mbps (megabits per second),
•Kbps (kilobits per second),
• or bps (bits per second).
If the bandwidth of a network is 1 Mbps, then 1 megabit of data can be
transmitted over that network in 1 second.
The ACTUAL RATE OF TRANSFER OF DATA will vary
depending on the ISP’s equipment,
the type of Internet connection,
and the number of people using the same connection at
one time.
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Types of Internet Connection
• Narrowband–Dial-up–ISDN
• Broadband–DSL–Cable–Dedicated Leased Line (such as T1)–Wireless (Wi-Fi)
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Dial-up• The most common type of connection for
home users. • Considered the slowest but have the
reputation of being the most inexpensive. • Connection rates for dial-up modems tend to
fall at around 56 kbps.• You cannot use the telephone for the Internet
and phone calls for the same time.
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Integrated Services Digital Network
• ISDN is a type of digital telephone connection that offers data transfer rates of up to 128 kbps.
• This can be a better than dial-up, however ISDN connections are considered still more or less outdated.
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Digital Subscriber Line (DSL)
• Becoming widely available and can provide an excellent connection.
• Allows you to use the phone normally while connected to the Internet.
• DSL connections can be costlier than dial-up.
• DSL operates starting at 512 Kbps
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Cable• Offers very fast and reliable connections
with a fixed monthly fee. • It will not affect how you use your
telephone. • Offers data transfer rates of
approximately 1 mbps to 6 mbps.• Cable connections are not always
available in all areas.Back
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Dedicated Leased Line• Directly connects your computer to your
ISP’s network. Capable of transferring data at 1, 544, 000 bits-per-second, such as T1.
• Upload and download speeds are the same (symmetric)
• Much more expensive than cable or DSL connections.
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Wireless (Wi-Fi)• No cords or wires for as long as you are
in a WiFi “hotzone”.• Wireless broadband connections: Wi-Fi,
Satellite broadband, Wireless DSL, and Wireless Digital Cable.
• Connection speeds ranging from as little as 256 Kbps to as much as 10+ Mbps.
• You have to stay within a certain radius to connect to a WiFi device.
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TYPE OF CONNECTION DESCRIPTION
Dial-up up to 56.6 Kbps.Digital Subscriber Line
(DSL) 384 kbps to 8 Mbps.
Cable modem 4 Mbps.
T1 1.544 MbpsT1 lines provide a dedicated phone line connection
Wireless 11 Mbps to 45 Mbpsmight not provide you the full data transfer
rates of the wired connection.
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