communication connectivity & internet

8/8/2019 Communication Connectivity & Internet

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Communication ConnectivityDial Up

y Dial-up Internet access is a form of Internet access that

uses the facilities of the public telephone network toestablish a dialed connection to an Internet serviceprovider (ISP) via telephone lines.

y

The user's computer uses an attached modem toencode and decode Internet Protocol packets andcontrol information into and from analogue audiofrequency signals, respectively.


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DSL (Digital Subscriber Line)y DSL or Digital Subscriber Line is a service provide

through existing telephone line but it works differently than regular dial up modem.

y DSL operates over normal telephone line and it can beused simultaneously with the telephone.

y DSL can increase the connection speed by 10 times thanregular Dial Up connection

Communication Connectivity


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B road B andy B roadband Internet access , often shortened

to just "broadband", is a high data rateconnection to the internet.

y Provides a speed of Up to 100 mbps.ISDN (Integrated Services Digital Network)

Cable ModemLeased LineSatellite B road B and

Communication Connectivity


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Internety The word Internet is derived from two words:

Interconnection & Networks.y Internet is a phenomenon of interconnection of

different computers through networks.y Internet is a worldwide system of computers, i.e.

network of networks, which allows the users toshare information on those linked computers.

y It is the most powerful and importanttechnological advancement since the introductionof desktop computers.


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Evolution of Internety The internet traces its origin back to 1960 s, when it

grew out of an experiment conducted by the USdepartment of defense. That network was known as ARPANET (Advanced Research Projects Agency Network), which links US scientific and academicresearchers.

y B y 1970 s, ARPA (Advanced Research Project Agency)helped in the development of new protocol known asTCP/IP protocol for transferring data betweennetworks. TCP/IP is the core of Internet.


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Evolution of Internety In 1980 s National Science Foundation (NSF) used

APRANET to link it five regional super computercenters at major universities so that many users couldshare their work.

y Later on, NSF created NSFNET (National ScienceFoundation Network), a series of network for researchand education communication.

y In 1980 s, Usenet news group and E-Mail came into

picture. In this decade Archie, WAIS (Wide AreaInformation Server) was also created.y To give users a easy to use interface, University of

Minnesota created Gopher, a simple menu driven

system to access files.


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y Internet really become popular in 1990 s after thedevelopment of W orld Wi de W eb (WWW). B efore thatit was opened to a limited numbers of sites only.

y In 1991 CERN released WWW. The CERN teamdeveloped the protocol based on Hypertext (HTTP)that makes it possible to connect content on the WE B

through hyperlinks.y WWW permits the user to access the information

using GUI.

Evolution of Internet


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Bas ic Internet Term sy Web Pagey Websitey Home Pagey B rowser

y Texty Graphical

y Uniform Resource Locatory Hypertexty Internet Service Providersy Web Servery Download and Uploady Online & Offline


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y World Wide Weby Electronic Maily File Transfer Protocoly Telnety Internet Relay Charty Chatting and Instant Messagingy Internet Telephony y Video Conferencingy Commerce through Internet

S ervice s provided by Internet


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S ervice s provided by InternetW orld W ide W eb

The WWW is one of the most popular service available onthe internet. It presents texts, images, animation, videos, sound and other multimedia in a single

interface.E lectronic Mail ( E- Mail)

E-Mail is a fast, easy and inexpensive way to communicate with other internet users around the world. It is one of

the basic and most used service of internet. Each Userof E-Mail has a mail box to which messages are sentand the mail box can be accessed from anywhere andanytime. Email can also be used to send documents,images , audio, video etc as attachments.


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F ile Transfer ProtocolFTP is a system of rules and software program that enables

a user to logon to another computer and transfer theinformation between it and his computer.

It was the first service developed for internet so thatgovernment and educational institution can easily exchange files.

FTP allows the user to get access to the files stored in the

directory of remote computer connected to internet.Using FTP, one can download or upload files from the

remote computers if they have access permission toremote machine.



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TE LNE TThe word TELNET is derived from Telecommunication

and Network and it allows user to Log On to a remotecomputer.

Telnet is also known as remote login, which meansconnecting one machine to another in such a way thata person may interact with another machine as if it isbeing used locally.

The user s computer which initiates the connection, isreferred as Local Computer or Telnet Client and, thecomputer which accepts the connection, is referred asRemote Computer or Telnet Server.

To transmit information it uses TCP/IP protocol.



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IRC (Internet Relay Chat)IRC is a service on internet that allows people to

communicate in the real time and carry onconversation via computer with one or more people.

It provides the users with facility to engage in conversation with other users from anywhere in the world.

Chatting and Instant MessagingChat programs allows users on the internet to

communicate with each other by typing in real time.They sometimes included as a feature of Website.



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Internet Telephony Internet Telephony is the use of internet rather than

traditional telephone computer infrastructure, toexchange spoken or other telephonic information.

It consist of hardware and software that enable people touse the internet as a transmission medium fortelephone calls.

Ex: Cool talk, Net meeting, Yahoo messenger, Skype etc.

With this facility users can call anywhere in the world witha lower cost.



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V ideo Conferencing Video conferencing uses the same technology as IRC and

enables direct face to face communication acrossnetwork.

A video conferencing system has two or more parties indifferent locations which have the ability tocommunicate using a combination of video, audio anddata.

Elements required for Video Conferencing1. Camera2. Visual Display 3. Audio System4. Compression

5. User Interface and Control System



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Commerce through InternetToday business is taking place through electronic

telecommunication media. Various organizationsoffers the facility to shop online. This type of businessmodel is known as E-Commerce.

E-Commerce refers to buying and selling goods online. Itintegrates communication, Data Management, andsecurity capabilities, which allows organizations to

exchange information about the sales of goods andservices.

Ex. E-B ay, Amazon, Dell, On Sale etc.


communication connectivity & internet

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