Slide introduction to information ssstem 10th obien chap006 eng

James A. O’Brien

Introduction to Information Systems

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Chapter

Telecommunications and
Networks

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James A. O’Brien

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Introduction to Information Systems

Chapter Objectives
• Identify several major developments and
trends in the industries, technologies, and
applications of telecommunications and
networks.
• Identify the basic components, functions,
and types of telecommunications networks.
• Explain the functions of major types of
telecommunications network hardware and

media.

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James A. O’Brien

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Introduction to Information Systems

Trends in Telecommunications
Industry Trends

More vendors, carriers, alliances, an
services, accelerated by deregulation & Internet growth

Extensive
Technology
TrendsInternet, interconnected local & global

digital networks, improved transmission channels

electronic commerce, enterprise collaboration,
ApplicationMore
Trends

online business operations and strategic advantage in markets

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James A. O’Brien

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Introduction to Information Systems

Telecommunications Strategic Capabilities
Overcome
Overcome Geographic Barriers: Capture information about
business
business transactions
transactions from
from remote
remote locations.
locations.
Overcome
Overcome Time Barriers: Provide
Provide information
information to
to remote
remote locations
locations
immediately
immediately after it is requested.
Overcome
Overcome Cost Barriers: Reduce the cost of more traditional
means
means of

of communications.
communications.
Overcome
Overcome Structural Barriers: Support linkages for competitive
advantage.
advantage.

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James A. O’Brien

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Introduction to Information Systems

Internet Applications
Telnet

E-mail

E-Commerce

Internet
Relay
Chat

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Popular Uses

of the
Internet

File
Transfer
Protocol (FTP)

Search Engines


James A. O’Brien

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Introduction to Information Systems

Basic Components in a Telecommunications Network

1

Telecommunications
Processors

4

3

5
Telecommunications
Telecommunications

Software
Software

2

PCs, NCs,
and Other
Terminals

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2

Telecommunications
Channels and Media

Computers


James A. O’Brien

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Introduction to Information Systems

Wide Area Networks

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James A. O’Brien

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Introduction to Information Systems

Local Area Networks
PC

PC

PC

Shared
Database and
Software Packages

Network
Network
Server
Server

Shared
Printer

PC

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PC

Internetwork Processor to Other Networks


James A. O’Brien

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Introduction to Information Systems

Other E-Business Networks

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The
Internet
Router
Intranet
Server

Extranet

Fire wall

Fire wall

Router
Intranet
Server

Host System


James A. O’Brien

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Introduction to Information Systems

Client/Server Networks and Network Computing
Client

User Interface
Application Processing

Network
Network
Server
Server

Application Control
Distributed Database

Host
Host System
System
Superserver
Superserver
Central database control

Heavy duty processing

NetPC
Application
Server
Server

DB
Server
Server

Browser-based
User Interface

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Web OS
DBMS
Application Software


James A. O’Brien

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Introduction to Information Systems

Telecommunications Communication Media
•

•
•
•

Twisted Pair
Coaxial Cable
Fiber Optics
Terrestrial
Microwave

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• Communication
Satellites
• Cellular
Technologies
• Wireless LAN


James A. O’Brien

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Introduction to Information Systems

Telecommunications Processors and Software
•
•
•

•

Network Operating System
Modems
Multiplexers
Telecommunications
Monitor
Internetwork Processors
Middleware
– Switches
Network
Management Software
– Routers
– Hubs
– Gateways

• Fire walls

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James A. O’Brien

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Introduction to Information Systems

Network Topologies

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James A. O’Brien

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Introduction to Information Systems

Network Protocols: The OSI Architecture
Application
ApplicationLayer
Layer
Presentation
PresentationLayer
Layer

Seven
Layers of
the OSI
Communications
Architecture

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Session
SessionLayer
Layer
Transport

TransportLayer
Layer
Network
NetworkLayer
Layer
Data
DataLink
LinkLayer
Layer
Physical
PhysicalLayer
Layer


James A. O’Brien

The Internet’s TCP/IP
Application
Layer

Application or
Process Layer

Presentation
Layer
Session
Layer

Host-to-Host Transport Layer

Transport
Layer

Internet Protocol (IP)

Network
Layer

Network Interface

Data Link
Layer

Physical Layer

Physical
Layer

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OSI Model

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Introduction to Information Systems


James A. O’Brien

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Introduction to Information Systems

Chapter Summary
• Organizations are becoming internetworked
enterprises that use the Internet, intranets, and
other telecommunications networks to support EBusiness.
• Telecommunications has entered a deregulated
and fiercely competitive environment with many
vendors, carriers, and services
• A major trend is towards pervasive use of the
Internet and its technologies to build
interconnected enterprise and global networks.

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James A. O’Brien

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Introduction to Information Systems

Chapter Summary (cont)
• The major components of any
telecommunications network are:
– Terminals,

– Telecommunications processors,
– Communication channels,
– Computers, and
– Telecommunications software.

• There are several basic types of telecomm
networks, including wide area networks
(WANs) and local area networks (LANs).

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James A. O’Brien

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Introduction to Information Systems

Chapter Summary (cont)
• Key telecommunications network
alternatives include telecommunications
media, processors, software, channels, and
architectures.

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