Telecommunication and Networks

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Chapter 5

• Telecommunication and Networks

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Telecommunication Principles and Applications

• Communication
• The exchange of information between two parties
• Telecommunication
• Communication at a distance

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Telecommunication Principles and Applications

• Dimensions of Telecommunication
• Distance significantly affects options for
  communication
• Organizational context establishes the nature of
  the relationships between the communicating
  parties

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Dimensions of Telecommunication
Dimension Possible Values
Distance Face-to-face Building or campus Metropolitan area Wide area
Organizational Context Organizational members only Organizational members and partners Public
Human/Computer Context Human/Human Human/Computer (Input/Output) Computer/Computer
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Telecommunication Principles and Applications

• Telecommunication Process
• Sender initiates message communication
• Device puts senders message onto a
  telecommunication medium
• Telecommunication medium transfers message to
  receivers location

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Telecommunication Principles and Applications

• Telecommunication Process
• Device takes message off the communication medium
  
• Recipient receives the message

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Telecommunication Principles and Applications

• Types of Business Applications
• Coordination of business activities
• Group decision making
• Electronic commerce

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Telecommunication Infrastructure

• Communication Carriers
• Telephone Carriers
• Local Exchange Carriers (LECs)
• Long Distance Carriers
• Cellular Services
• Cable Providers
• Value Added Networks (VANs)
• Resells transmission capacity with additional
  services

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Telecommunication Infrastructure

• International Issues
• Monopoly government providers in many countries
• Decreasing regulation worldwide
• Cross-border data flow regulations
• Differences in privacy rules

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Telecommunication Technology

• Standards
• Characteristics of telecommunications media,
  hardware, and software
• Open Systems Interconnection (OSI) Model
• Provides a framework for thinking about
  communication standards

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Telecommunication Technology

• The Computer/Medium Interface
• Modem
• Converts digital computer output to signal needed
  for transmission and vice versa
• Adaptor/NIC
• Interface between computer and a network

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Telecommunication Technology

• Transmission Media
• Twisted pair wire
• Coaxial cable
• Fiber optic cable
• Microwave signals
• Infrared signals
• Radio signals

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Telecommunication Technology

• Switching and Routing Technologies
• Devices
• Hub
• Switch
• Router
• Gateway
• Protocol
• Standard for how a message is packaged, secured,
  sent routed, received, and acknowledged by the
  receiver within a network

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Telecommunication Technology

• LAN Protocols
• Ethernet
• Token ring
• Wi-Fi
• Bluetooth

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Telecommunication Technology
Figure 5-9
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Telecommunication Technology

• WAN Services
• Leased lines
• Switched circuit data services
• Packet switched services
• Cellular services

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Internet Concepts

• Who Manages The Internet?
• Companies, individuals, and governments own
  pieces of the Internet, but the Internet as a
  whole has no owners or operators

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Internet Concepts

• Network Addressing
• IP Number
• Consists of two partsa network number and a
  device number
• Domain Name
• Translated to IP number by Domain Name Servers
  (DNSs)

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Network Management

• Simple Network Management Protocol
• Defines how network devices maintain and
  communicate information about their own activity
  and performance

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Network Management

• Network Analyzer
• Plugs into a network and analyzes the traffic
  that passes by or through it

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Network Management

• Network Management Software
• Device management
• Recognizes the devices, including computers and
  printers, that are connected to the network
• Security services
• Provide entry into the network and establish a
  relationship between a user and a client station
  

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Network Management

• Network Management Software
• File services
• Provide access to shared files
• Print services
• Provide central access to a common printer
• Fax services
• Allow network users to send or receive a
  facsimile electronically

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Network Management

• Network Management Software
• Directory services
• Provide an enterprise-wide telephone book that
  identifies and connects network users to each
  other and to software

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EnsuringTelecommunication Security

• Key A secret code that can scramble or
  unscramble a message
• Public Key Cryptography
• Uses a pair of keys
• Message scrambled by one key can only be
  unscrambled by the other

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EnsuringTelecommunication Security
Figure 5-9 Public Key Cryptography
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EnsuringTelecommunication Security

• Public key cryptography ensures
• Security
• Non-repudiation
• Authentication
• Requires certificate authority
• Non-repudiation
• Via digital signature
• Integrity

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EnsuringTelecommunication Security

• Firewall
• Hardware and/or software intended to separate an
  organizations intranet, and the data on it, from
  its extranet and the Internet
• Virtual Private Network (VPN)
• Simulates a private network by using a public
  network, such as Internet, and security protocols

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End of Chapter 5

• Telecommunication and Networks