Transcript Lecture 01

NETE0510
Communication Media and
Data Communications
Dr. Supakorn Kungpisdan
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Supakorn Kungpisdan
 Education
 PhD (Computer Science and Software Engineering), Monash
University, Australia
 M.Eng (Computer Engineering), KMUTT
 B.Eng (Electrical Engineering), Thammasat
 Specializations
 Information and Network Security, Electronic Commerce,
Formal Methods, Computer Networking
 Experience
 External Research Advisor, Network Security Research
Group, Monash University, Australia
 Business Development Director, CyberPlanet Interactive
 http://www.mut.ac.th/~supakorn/
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Course Descriptions
 Timetable: Saturday 09.00AM-12.00PM
 Textbooks
D. L. Spohn, Data Network Design, 3rd Edition, Osborne,
ISBN 0-07-219312-3
L. L. Peterson and B. S. Davie, Computer Networks: A
Systems Approach, 3rd Edition, Elsevier, ISBN 81-8147206-3
W. Stallings, Data and Computer Communications, 8th
Edition, Pearson Prentice Hall, ISBN 0-13-238195-8
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Outline
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Data Communications: Past to Future
Understanding the Standards and Their Makers
Introduction to Transmission Technologies
Multiplexing and Switching Technologies
Optical Networking
Physical Layer Protocols and Access Technologies
Common Protocols and Interfaces in the LAN Environment
Frame Relay
Common WAN Protocols – ATM
Wireless LANs and Cellular Networks
Common Protocols and Interfaces in the Upper Layers (TCP/IP)
Emerging Technologies
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Evaluation Criteria
Assignment: 30%
Midterm Exam: 30%
Final Exam: 40%
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Data Communications: Past to
Future
Supakorn Kungpisdan
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Outline
 Defining Data Communications Needs
 The Telephone Network: Current Network
Infrastructure
 The Data Revolution
 Applications and Key Enablers
 Communications Technologies as Enablers
 Corporate Infrastructure Changes
 The Data Network of the Twentieth Century
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Data Communications
 Data VS Information
 Data Communications enables consumers or businesses
to communicate in some form or fashion
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Data Communications Network
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Data Communications Network (cont’d)
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Data Communications Needs
 Primary personnel’s and applications’ communications
patterns:
 A drive for longer working hours
 Data that is graphically and bandwidth intensive
 A desire for any-to-any extranet communications patterns
 Corporate and government communications needs
 Increased LAN and application connectivity between
departments, customers, and suppliers
 The continued movement of mainframe applications to a
distributed client-server architecture
 The movement of applications into the network (ASP and ecommerce)
 The emergence of a new class of image and graphics-intensive
interactive applications
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Brief History of Communications
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Brief History of Communications (cont’d)
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Spoken human communications – 50,000 yrs
Graphic images in caves – 20,000 yrs
Written language – 5,000 yrs
Optical telegraphy – 17th-18th century
Electrical telegraphy – 1846
Television broadcasting – 1940s
Fiber Optic Transmission – 1980s
Asynchronous Transfer Mode
WDM (Wavelength Division Multiplexing) and DWDM (Dense
Wavelength Division Multiplexing) for fiber-optic cable
ARPANET, the first packet-switched network – 1971
Ethernet, developed by Xerox, DEC, and Intel – 1974
Token Ring in IBM environment, Ethernet for the rest
Client-Server over LAN, MAN, WAN signaled the beginning of
modern data communications
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Outline
 Defining Data Communications Needs
 The Data Revolution
 Applications and Key Enablers
 Communications Technologies as Enablers
 Corporate Infrastructure Changes
 The Data Network of the Twentieth Century
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Data Communications Takes the Lead
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Key Services and Switching Techniques
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Private lines
X.25 – a packet-switched network over telephone network
IP
Narrow-band ISDN: a type of circuit-switched telephone network
system
DSL (Digital Subscriber Line) and Cable – data at higher freq, voice
at lower freq
Vo packet
MPLS (Multiprotocol Label Switching) – simulates a circuit-switched
N/W over a packet-switched N/W
Circuit switching
Frame Relay
Asynchronous Transfer Mode (ATM)
SONET (Synchronous Optical Networking) and Dense Wavelength
Division Multiplexing (DWDM)
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Data Communications Takes the Lead
(cont’d)
44.736Mbps
64kbps/1.544Mbps
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Outline
 Defining Data Communications Needs
 The Data Revolution
 Applications and Key Enablers
 Communications Technologies as Enablers
 Corporate Infrastructure Changes
 The Data Network of the Twentieth Century
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Application Demand for Bandwidth
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Application Demand for Bandwidth
(cont’d)
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New Multimedia Applications
Multimedia: the combination and presentation of multiple forms for data to
the user (voice, video, and data interactive)
ATM supports delaysensitive traffic
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Outline
 Defining Data Communications Needs
 The Data Revolution
 Applications and Key Enablers
 Communications Technologies as Enablers
 Corporate Infrastructure Changes
 The Data Network of the Twentieth Century
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S-Curves of Technological Evolution
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FR, ATM, and IP Technology Enablers
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Outline
 Defining Data Communications Needs
 The Data Revolution
 Applications and Key Enablers
 Communications Technologies as Enablers
 Corporate Infrastructure Changes
 The Data Network of the Twentieth Century
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Corporate Infrastructure Changes
 High performance fiber-optic facilities based on
SONET, WDM, DWDM
 From centralized to distributed processing,
distributed computing, client-server, and IP
internetworking
 Shared media to wire-speed switch
 Etc.
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WAN Transmission Infrastructure
Evolution
 The majority of WAN transmission infrastructures is
based on fiber-optic facilities
 Satellite communications provide connectivity to remote
areas. Some designed to handle ATM traffic
 Fiber-optic transmission using DWDM has replaced
microwave and digital transmission
 Etc.
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From Centralized to Distributed Networks
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Flattening
 Moving from hierarchical
structure to a distributed
structure
 In other words, fewer
network elements but
greater logical
interconnection
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Definitions
 Local Area Network (LAN) <= 0.1 km (350 ft)
 Campus Area Network (CAN) <=1 km between building in the same
area
 Metropolitan Area Network (MAN) <=10 km  providing regional
area connectivity (between campus)
 Wide Area Network (WAN) 100-10,000 kms  national connectivity
 Global Area Network (GAN) 1,000-20,000 kms  between nation
 Virtual LAN (VLAN)
 Storage Area Network (SAN) – high speed network used to
interconnect servers with data storage devices
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The Proliferation of LAN Switching
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Outline
 Defining Data Communications Needs
 The Data Revolution
 Applications and Key Enablers
 Communications Technologies as Enablers
 Corporate Infrastructure Changes
 The Data Network of the Twentieth Century
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Private and Virtual Private Networks
(VPNs)
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VPNs
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VPNs
Advantages
Reduced access and transport circuit charges
Capability to satisfy high peak bandwidth demands
Cost impacts proportional to usage
Enhanced availability and reliability
 Disadvantages
Less predictable capacity availability
Less user control
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Questions?
Next Lecture
Understanding the Standards
and Their Makers
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