11' Building Information Systems

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8
Chapter
TELECOMMUNICATIONS AND NETWORKS
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
THE TELECOMMUNICATIONS REVOLUTION

• Telecommunications Communication of information
  by electronic means
• The marriage of computers and communications The
  1996 Telecommunications Deregulation and Reform
  Act
• The Information Superhighway High-speed digital
  telecommunications networks, accessible by the
  general public

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Telecommunications System Components

• Computers to process information
• Terminals or any input/output devices that send
  or receive data
• Communications processors
• Communications software

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Components of a Telecommunications System
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Functions of Telecommunications Systems

• Transmit information
• Establish interface between sender and the
  receiver
• Route messages along most efficient paths
• Perform elementary processing of information
• Perform editorial tasks on data
• Convert message speed or format
• Control flow of information

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Types of Signals Analog and Digital

• Analog signal
• Continuous waveform
• Passes through communications medium
• Used for voice communications

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Types of Signals Analog and Digital

• Digital signal
• Discrete waveform
• Transmits data coded into two discrete states as
  1-bits and 0-bits
• Used for data communications
• Modem
• Translates computers digital signals into analog
  and vice versa

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Functions of the Modem
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Communications Channels

• Twisted wire Telephone systems
• Coaxial cable Cable television
• Fiber optics and optical networks Dense wave
  division multiplexing (DWDM)

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Communications Channels

• Wireless transmission Microwave, Satellites,
  Paging systems, Cellular telephones, Personal
  communication Services, Personal digital
  assistants, Mobile data networks
• Transmission Baud, bandwidth

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Frequency Ranges for Communications Media and
Devices
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Amocos Satellite Transmission System
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMPONENTS AND FUNCTIONS OF A TELECOMMUNICATIONS
SYSTEM
Communications Processors and Software

• Front-end processor Manages communications for
  the host computer
• Concentrator Collects and temporarily stores
  messages
• Controller Supervises communication traffic
• Multiplexer Enables single communication channel
  to carry data transmissions

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
Network Topologies

• Star Network All computers and other devices are
  connected to a central host computer
• Bus Network Links a number of computers by a
  single circuit
• Ring Network All computers are linked by a
  closed loop

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
A Star Network Topology
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
A Bus Network Topology
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
A Ring Network Topology
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
Private Branch Exchanges, Local Area Networks
(LANs), and Wide Area Networks (WANs)

• Private Branch Exchanges
• Central switching system
• Handle firms voice and digital communications

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
Private Branch Exchanges, Local Area Networks
(LANs), and Wide Area Networks (WANs)

• Local Area Networks
• Telecommunication network
• Require its own dedicated channels
• Encompass a limited distance
• Gateway, router, Network Operating System (NOS),
  peer-to-peer

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
A Local Area Network (LAN)
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
Private Branch Exchanges, Local Area Networks
(LANs), and Wide Area Networks (WANs)

• Wide Area Networks (WANs)
• Telecommunication network
• Span large geographical distance
• Consist of variety of cable, satellite, and
  microwave technologies
• Switched lines, dedicated lines

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
Network Services and Broadband Technologies

• Value-Added Networks (VANs)
• Private, multipath, data-only, third-party-managed
  network
• Other Network Services
• Packet switching, Frame Relay, Asynchronous
  transfer mode (ATM)
• Integrated Services Digital Network (ISDN),
  Digital subscriber line (DSL), Cable modems, T1
  line, Broadband

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
Packed-Switched Networks and Packet Communications
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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
COMMUNICATIONS NETWORKS
Network Convergence

• Converged network
• Network with technology
• Enables voice and data to run over a single
  network
• Unified messaging
• System combining voice messages, email, and fax

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
Electronic Commerce and Electronic Business
Technologies
Electronic Mail and Groupware

• E-mail Eliminates telephone tag and costly
  long-distance telephone charges
• Groupware Enables work groups at different
  locations to participate in discussion forums and
  work on shared documents and projects

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
Electronic Commerce and Electronic Business
Technologies
Voice Mail and Fax

• Voice mail Digitizes spoken message and
  transmits it over a network
• Fax Digitizes and transmits documents over
  telephone lines

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
Electronic Commerce and Electronic Business
Technologies
Teleconferencing, Dataconferencing, and
Videoconferencing

• Teleconferencing Ability to confer with a group
  of people simultaneously
• Data conferencing Two or more users can edit and
  modify data files simultaneously
• Videoconferencing Participants are able to see
  each other over video screens

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
Electronic Commerce and Electronic Business
Technologies
Digital Information Services, Distance Learning
and E-Learning

• Distance learning Education or training
  delivered over a distance to individuals in one
  or more locations
• E-learning Instruction delivered online using
  the Internet or private networks

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
Electronic Commerce and Electronic Business
Technologies
Electronic Data Interchange (EDI)

• Direct computer-to-computer exchange between two
  organizations of standard business transaction
  documents

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Essentials of Management Information
Systems Chapter 8 Telecommunications and Networks
Electronic Commerce and Electronic Business
Technologies
Electronic Data Interchange (EDI)