NETE05101 NETE0510 Communication Media and Data Communications Dr. Supakorn Kungpisdan.
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Transcript of NETE05101 NETE0510 Communication Media and Data Communications Dr. Supakorn Kungpisdan.
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NETE0510Communication 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 81-8147-206-3
W. Stallings, Data and Computer Communications, 8 th Edition, Pearson Prentice Hall, ISBN 0-13-238195-8
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Outline1. Data Communications: Past to Future2. Understanding the Standards and Their Makers3. Introduction to Transmission Technologies4. Multiplexing and Switching Technologies5. Optical Networking6. Physical Layer Protocols and Access Technologies7. Common Protocols and Interfaces in the LAN Environment8. Frame Relay9. Common WAN Protocols – ATM10. Wireless LANs and Cellular Networks11. Common Protocols and Interfaces in the Upper Layers (TCP/IP)12. 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 e-
commerce) 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)
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
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)
64kbps/1.544Mbps
44.736Mbps
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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 delay-sensitive 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