Internet ConnectionsInternet Connections

ByByBhupendra Ratha, LecturerBhupendra Ratha, Lecturer

School of Library and Information Science School of Library and Information Science Devi Ahilya University, IndoreDevi Ahilya University, Indore

Email: Email: bhu261@gmail.combhu261@gmail.com

How to acquire Connection?How to acquire Connection?

We are Basically connected with internet byWe are Basically connected with internet by

Internet Service Provider (ISP) / Internet Internet Service Provider (ISP) / Internet Access Provider (IAP)Access Provider (IAP)

Wireless Service Provider (WSP)Wireless Service Provider (WSP)

Internet Service Provider (ISP)Internet Service Provider (ISP)

ISP is a business or organization that provides access ISP is a business or organization that provides access to Internet and related services to consumers.to Internet and related services to consumers.

Mostly, an ISP is a telephone company.Mostly, an ISP is a telephone company.

Common offer is Dialup and DSL ConnectionCommon offer is Dialup and DSL Connection

Wireless Service Provider (WSP)Wireless Service Provider (WSP)

A company that provides wireless Internet A company that provides wireless Internet access to the users with wireless modems.access to the users with wireless modems.

Notebooks/laptops and Cellular phones are Notebooks/laptops and Cellular phones are example of wireless devices accessing the example of wireless devices accessing the internet.internet.

TYPE OF INTERNET CONNECTIONS

– Dialup– Cable Connection– DSL Broadband– Dedicated Leased Line– ISDN – Wireless Connection

Dial up connectionDial up connection

Dial up connectionDial up connection Dial-up connections are the most common

type of Internet Connection for home users. Dial-up connections today are considered the

slowest but the reputation of being most inexpensive. Connection rates for dial-up modems tend to fall between 24 kbps to 56 kbps.

Features of dial upFeatures of dial up Uses POTS (Plain Old Telephone System)Uses POTS (Plain Old Telephone System)

Provides a low cost need based access.Provides a low cost need based access.

Bandwidth 24 to 56 Kbps. Bandwidth 24 to 56 Kbps.

On the Customer End Modem is connected to a Telephone On the Customer End Modem is connected to a Telephone Line.Line.

Achievable bandwidth depends on the line quality.Achievable bandwidth depends on the line quality.

Cable Connection

Cable Connection

Cable connection offers very fast and reliable connections with fixed monthly fee. Because cable connections use a different medium to connect you to the Internet, it will not affect how you use your telephone.

Cable broadband Internet connections offer data transfer rates of approximately 1.5 Mbps up to 7.5 Mbps.

DSL connection

DSL connection Digital Subscriber Line or DSL connections

are becoming widely available and can provide you with an excellent Internet connection.

DSL allows you to use the phone normally while connected to the internet. The disadvantage of DSL connections can be costlier than dialup. DSL operates at 512 kbps up to 20 mbps.

Dedicated Leased Line

A dedicated leased line is a point-to-point, high speed communication line that directly connects your computer to your ISP’s network. The speed of your internet access depends on the type of leased line you have.

Dedicate Leased Line is much more expensive than the DSL and Cable Connection.

Features of Features of Dedicated Leased Line Used to provide point-to-point dedicated network Used to provide point-to-point dedicated network

connectivity.connectivity.

Analog leased line can provide maximum bandwidth of 9.6 Analog leased line can provide maximum bandwidth of 9.6 Kbps.Kbps.

Digital leased lines can provide bandwidths Digital leased lines can provide bandwidths 64 Kbps.64 Kbps.

ISDNISDN

ISDN

ISDN Connection are a type of telephone connection that offer data transfer rates of up to 128 kbps. This can be better than dialup, however ISDN connections are considered still more or less outdated.

Feature of ISDNFeature of ISDNAnother alternative to using analog telephones lines to Another alternative to using analog telephones lines to establish a connection is ISDN. establish a connection is ISDN.

Speed is one advantage ISDN has over telephone line Speed is one advantage ISDN has over telephone line connections. connections.

ISDN network is a switched digital network consisting of ISDN network is a switched digital network consisting of ISDN Switches.ISDN Switches.

Each node in the network is identified by hierarchical Each node in the network is identified by hierarchical ISDN address which is of 15 digits.ISDN address which is of 15 digits.

ISDN user accesses network through a set of standard ISDN user accesses network through a set of standard interfaces provided by ISDN User Interfaces.interfaces provided by ISDN User Interfaces.

Comes in two “sizes”Comes in two “sizes” Basic Rate (Bell Micro Link)Basic Rate (Bell Micro Link)

– 2 Bearer channels, each 64Kbps2 Bearer channels, each 64Kbps– 1 Data channel, 16Kbps1 Data channel, 16Kbps

Primary Rate (Bell Mega Link)Primary Rate (Bell Mega Link)

- 23 channels, each 64Kbps- 23 channels, each 64Kbps– 1 Data channel, 64Kbps1 Data channel, 64Kbps

Applications of ISDNApplications of ISDN

Call Centers Call Centers

Internet accessInternet access

VideoconferencingVideoconferencing

ISDN in Call CentresISDN in Call Centres

Connect the customer to the phone networkConnect the customer to the phone network– Lower customer hardware costsLower customer hardware costs– Fewer trunksFewer trunks– Almost instantaneous call setupAlmost instantaneous call setup– Detailed signallingDetailed signalling

ISDN for Video ConferencingISDN for Video Conferencing

Video equipment needs n x 64K. 1<n<24Video equipment needs n x 64K. 1<n<24 If n>2, Inverse multiplexer sits between video If n>2, Inverse multiplexer sits between video

conferencing hardware and phone company.conferencing hardware and phone company. Handles all signalling, e.g. “dialling” Handles all signalling, e.g. “dialling” Combines multiple B channels to a single streamCombines multiple B channels to a single stream Can use part of a Primary Rate InterfaceCan use part of a Primary Rate Interface Can combine several Basic Rate InterfacesCan combine several Basic Rate Interfaces Call-by-call or minute-by-minuteCall-by-call or minute-by-minute

ISDN for Internet AccessISDN for Internet Access

Usually via a router on a LANUsually via a router on a LAN Router will dial on demand, connect quicklyRouter will dial on demand, connect quickly May be nailed up for incoming callsMay be nailed up for incoming calls Low cost, reliable, digital serviceLow cost, reliable, digital service

– No connect charges for local callsNo connect charges for local calls

Symmetrical so good for serversSymmetrical so good for servers