Telecommunications and
Networks
Chapter 6
Principles of Information Systems,
Sixth Edition
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Chapter 6 Outline
• An Overview of Communications
Systems
• Telecommunications
• Networks and Distributed
Processing
• Telecommunications and
Applications
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Overview of
Telecommunications Systems
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Communications
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Communications
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Telecommunications
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Telecommunications Media
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Basic Media Characteristics
• Channel Types
– Simplex channel
– Half-duplex
– Full-duplex channel
• Bandwidth
– The range of frequencies that an electronic signal
occupies on a given transmission medium.
– Used colloquially to mean data rate
• Broadband
– Transmission sent over a wide frequency band,
– Used colloquially to mean a very high data
transmission rate
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Sixth Edition
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Shannon’s Fundamental Law of
Information Theory
• The information carrying capacity of a channel is
directly proportional to its bandwidth - the
broader the bandwidth, the more information
that can be carried.
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Media Types
•
•
•
•
Twisted-Pair
Coaxial Cable
Fiber-Optic Cable
Microwave Transmission (“wireless”)
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Twisted-Pair Wire Cable
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Coaxial Cable
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Fiber Optic Cable
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Microwave Transmission
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Satellite Transmission
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Cellular Transmission
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Telecommunications
Devices
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Devices
• Modems:
– Analog
– Digital
• Special-purpose modems
• Multiplexers
• Front-end processors
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Modems
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Multiplexers
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Front-End Processors
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Carriers and Services
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Carriers and Services
•
•
•
•
•
•
•
•
Common carriers
Value-added carriers
Switched and dedicated lines
Private branch exchange (PBX)
Wide-area telecommunications service (WATS)
Phone and dialing services
Digital subscriber line (DSL)
T1 Carrier
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ISDN and Telecommunications
Convergence
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Carriers and Services
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Networks & Distributed
Processing
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Sixth Edition
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Basic Processing Strategies
• Centralized processing
• Decentralized processing
• Distributed processing
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Sixth Edition
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Network Topologies and Types
• Network topologies
– Ring network
– Bus network
– Hierarchical
– Star network
– Hybrid network
• Network types
– Local Area Networks
– Wide Area Networks
– International networks
– Home and small business networks
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Network
Topologies
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Local Area
Networks
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Wide Area Networks
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Home and Small Business Networks
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Terminal-to-Host
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File Server
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Client/Server
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Communications Software and
Protocols
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Network Software and Protocols
• Network Software
– Network operating systems (NOS)
– Network management software
• Network Protocols
– Open Systems Interconnection (OSI) model
– Transmission Control Protocol/Internet
Protocol (TCP/IP)
– Systems Network Architecture (SNA)
– Ethernet
– Asynchronous Transfer Mode (TM)
– Bluetooth
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Open Systems Interconnection (OSI) Model
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Sixth Edition
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Network Interconnectivity
Technology
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Sixth Edition
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Bridge, Routers, and Gateways
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Telecommunications and
Applications
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Telecommunications and
Applications
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Voice mail
Electronic Software Distribution (ESD)
Telecommuting
Videoconferencing
Electronic Data Interchange (EDI)
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Videoconferencing
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Electronic Data Interchange (EDI)
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Public Network Services
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Summary
• Communications - any process that
permits information to pass from a
sender to one or more receivers
• Telecommunications media - twistedpair wire cable, coaxial cable, and fiberoptic cable
• Modems - convert signals from digital to
analog for transmission, then back to
digital
• Ethernet - the most widely installed local
area network (LAN) technology
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Principles and Learning Objectives
• Effective communication is essential to
organizational success
– DEFINE THE TERMS COMMUNICATION
AND TELECOMMUNICATIONS AND
DESCRIBE THE COMPONENTS OF A
TELECOMMUNICATIONS SYSTEM.
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Principles and Learning Objectives
• An unmistakable trend of communications technology is
that more people are able to send and receive all forms
of information over greater distances at a faster rate.
– IDENTIFY THREE BASIC TYPES OF COMMUNICATIONS
MEDIA AND DISCUSS THE BASIC CHARACTERISTICS OF
EACH.
– IDENTIFY SEVERAL TYPES OF TELECOMMUNICATIONS
HARDWARE DEVICES AND DISCUSS THE ROLE THAT EACH
PLAYS.
– IDENTIFY THE BENEFITS ASSOCIATED WITH A TELECOM
NETWORK.
– NAME THREE DISTRIBUTED PROCESSING ALTERNATIVES
AND DISCUSS THEIR BASIC FEATURES.
– DEFINE THE TERM NETWORK TOPOLOGY AND IDENTIFY
FIVE ALTERNATIVES.
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Principles and Learning Objectives
• The effective use of telecommunications
and networks can turn a company into an
agile, powerful, and creative organization,
giving it a long-term competitive
advantage.
– IDENTIFY AND BRIEFLY DISCUSS
SEVERAL TELECOMMUNICATIONS
APPLICATIONS.
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End of Chapter 6
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