Dial Up, Leased Lines, DSL, VSAT, Internet

INFORMATION TECHNOLOGY
Dial – Up, Leased Lines, DSL, VSAT
Prof. Sameer Karna

Statistics from the IITF Report
The Emerging Digital Economy *
 To get a market of 50 Million People Participating:

 Radio took 38 years
 TV took 13 years
 Once it was open to the General Public, The Internet
made to the 50 million person audience mark in just 4

years!!!
 http://www.ecommerce.gov/emerging.htm
– Released on April 15, 1998
Delivered to the President and the U.S. Public on April 15, 1998 by
Bill Daley,
Secretary of Commerce and Chairman of the Information
Infrastructure Task Force
ASCII
 American Standard Code for Information
Exchange, code that represents English characters
as numbers, used to represent text and transfer
information between computers.
bandwidth
 the amount of data that can be transmitted
in a given amount of time, typically
expressed as bits per second (bps).
BCC
 blind carbon copy, a copy of an e-mail
message sent to a second recipient without
the address appearing in the original
mailing.
browser
 a software application used to access the
World Wide Web and view web pages
cable modem
 a modem designed to utilize cable television lines
and therefore capable of transmitting more
information with more bandwidth and faster
connection speeds.
dial-up account
 internet access account that enables a
computer to connect to the Internet via an
ISP computer using a modem.
domain name
 names used in URL's and corresponding to one or
more IP addresses. Domain names always carry a
suffix, the top-level domain name such as com or
edu. Domain names in a URL are case sensitive.
local area network
 computer network that covers a relatively small
area, such as a single building or company, and
allows for sharing devices such as printers or
services such as Internet connection.
Dial-up IP overview
 LAN connected via dial-up line
• LAN has assigned permanent IP address prefix
• border machine acts as a router between Internet and LAN
• border machine has 2 IP interfaces
 to the LAN
 to the dial-up line (and Internet)
• routing information (i.e. IP prefix of the LAN) must be

propagated to the Internet using routing protocol
• e-mail may be delivered to any machine in the LAN
Dial-up IP overview
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dr
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IP
IP
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dr
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your Internet
IP
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dr
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IP
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IP
permanent addresses, variable addresses
used exclusively by you (depend on location you dial to),
shared by many users
DSL Lines
 DSL (Digital Subscriber Line) is a technology for
bringing high-bandwidth information to homes
and small businesses over ordinary copper
telephone lines.
 A DSL line can carry both data and voice signals

and the data part of the line is continuously
connected.
 Digital Subscriber Line is a technology that assumes

digital data does not require change into analog form and
back.
Four Necessary Components of a DSL Connection
DSL splitter
DSL modem
DSLAM (multiplexer)
High Speed connection
DSL Lines
 Digital data is transmitted to your computer directly as
digital data and this allows the phone company to use a
much wider bandwidth for transmitting it to you.
 Most DSL technologies require that a signal splitter be

installed at a home or business, requiring the expense of a
phone company visit and installation. However, it is
possible to manage the splitting remotely from the central
office.
This is known as splitterless DSL.
Leased Lines
 A leased line is a contract between a service provider and

a customer, whereby the provider agrees to deliver a
dedicated telecommunication line connecting two
locations in exchange for a monthly rent (hence the term
lease). It is sometimes known as a 'Private Circuit' or 'Data
Line'
 An internet leased line is a premium internet connectivity

product, delivered over fibre normally, which is dedicated
and provides uncontended, symmetrical speeds.
Interconnection diagram showing six leased lines used to
interconnect a company’s four locations.
Leased Lines
 Typically, leased lines are used by businesses to connect
geographically distant offices. Unlike dial-up connections,
a leased line is always active.
 Because the connection doesn't carry anybody else's

communications, the carrier can assure a given level of
quality.
 Increasingly, leased lines are being used by companies,

and even individuals, for Internet access because they
afford faster data transfer rates and are cost-effective for
heavy users of the Internet.
THANK YOU

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INFORMATION TECHNOLOGY

Dial – Up, Leased Lines, DSL, VSAT

Prof. Sameer Karna

 To get a market of 50 Million People Participating:

 Once it was open to the General Public, The Internet

made to the 50 million person audience mark in just 4

• routing information (i.e. IP prefix of the LAN) must be

 A DSL line can carry both data and voice signals

 Digital Subscriber Line is a technology that assumes

 Most DSL technologies require that a signal splitter be

 A leased line is a contract between a service provider and

 An internet leased line is a premium internet connectivity

 Because the connection doesn't carry anybody else's

 Increasingly, leased lines are being used by companies,

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