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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