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Telecommunications and Networks

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... the terms communication and telecommunications ... but only one way at a time. Full-duplex channel two way, bi-directional ... Law of Information Theory ... – PowerPoint PPT presentation

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Title: Telecommunications and Networks


1
Telecommunications and Networks
  • Chapter 6
  • CST 332
  • Dr. Roger G. Clery

2
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.

3
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
    telecommunications network.
  • Name three distributed processing alternatives
    and discuss their basic features.
  • Define the term network topology and identify
    five alternatives.

4
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.

5
Overview of Telecommunications Systems
6
Communications
7
Communications
8
Telecommunications
9
Telecommunications Media
10
Basic Communications Channel Characteristics
  • Simplex channel one way only
  • Half-duplex two ways but only one way at a time
  • Full-duplex channel two way, bi-directional

11
Channels
  • Simplex radio and TV broadcast
  • Half- duplex CB radio
  • Full duplex telephone

12
Bandwidth
  • The absolute difference of the highest frequency
    minus the lowest frequency.
  • The amount of space that an electronic signal
    occupies on a given transmission medium.
  • BW Hf Lf
  • Bigger is better!

13
Broadband
  • Telecommunications in which a wide band of
    frequencies is available to transmit information,
    allowing more information to be transmitted in a
    given amount of time.
  • Technically, an analog circuit capable of many
    channels like cable TV

14
Shannons 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.
  • BPS BW log2(1signal/noise)

15
Types of Media
  • Twisted-Pair
  • Coaxial Cable
  • Fiber-Optic Cable
  • Radio
  • VHF, UHF, etc.
  • Microwave Transmission
  • Infrared (like your TV remote control)

16
Twisted-Pair Wire Cable
17
Coaxial Cable
18
Fiber Optic Cable
19
Microwave Transmission
20
Satellite Transmission
21
Cellular Transmission
22
Telecommunications Devices
23
Devices
  • Modems
  • Analog
  • Digital
  • Special-purpose modems
  • Multiplexers
  • Front-end processors

24
Modems
25
Multiplexers
26
Front-End Processors
27
Carriers and Services
28
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

29
Integrated Services Digital Network (ISDN)
30
Carriers and Services
31
Networks Distributed Processing
32
Basic Processing Strategies
  • Centralized processing mainframe computer
  • Decentralized processing LAN peer-to-peer
  • Distributed processing - LAN client server

33
Network Concepts and Considerations
  • Network topology
  • Ring network
  • Bus network
  • Hierarchical
  • Star network
  • Hybrid network
  • Network types
  • Local Area Networks
  • Wide Area Networks
  • International networks
  • Home and small business networks

34
Network Topology
35
Network Topology
36
Network Topology
37
Local Area Networks
38
Wide Area Networks
39
Home and Small Business Networks
40
Terminal-to-Host
41
File Server
42
Client/Server
43
Communications Software and Protocols
44
Communications Software
  • Network operating systems (NOS)
  • Network management software

45
Communications Protocols
  • Open Systems Interconnection (OSI) model
  • Transmission Control Protocol/Internet Protocol
    (TCP/IP)
  • Systems Network Architecture (SNA)
  • Ethernet
  • Asynchronous Transfer Mode (TM)
  • Bluetooth

46
Open Systems Interconnection (OSI) Model
47
Open Systems Interconnection (OSI) Model
48
Network Interconnectivity Technology
49
Interconnectivity
  • HUB no brains level 1 (but fast)
  • SWITCH some brains level 2
  • ROUTER smart level 3 (transport)
  • GATEWAY genius all 7 layers

50
Bridge, Routers, and Gateways
51
Telecommunications and Applications
52
Telecommunications and Applications
  • Voice mail
  • WWW web browsing shopping
  • Electronic software distribution (upgrades)
  • Telecommuting
  • Videoconferencing
  • Electronic data interchange (EDI)

53
Videoconferencing
54
Electronic Data Interchange (EDI)
55
EDI Electronic Data Interchange
  • Standard format
  • Legally enforceable
  • Often automatically generated
  • Requirement in auto industry and grocery industry

56
Public Network Services
57
Protocols for the net
  • HTML for web pages
  • lttitlegt Protocols for the net lt/titlegt
  • XML for identifying data to legacy back-end
    processors/databases
  • ltfirstnamegt Roger lt/firstnamegt

58
Summary
  • Communications - any process that permits
    information to pass from a sender to one or more
    receivers
  • Telecommunications media - twisted-pair wire
    cable, coaxial cable, and fiber-optic cable
  • Modems - convert signals from digital to analog
    for transmission, then back to digital
  • Ethernet - the most widely installed local area
    network (LAN) technology

59
End
  • Do you not the terms??
  • Can you describe how it works?
  • Can you describe how it fits together with other
    parts to make a working system?
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