nete05101 nete0510 communication media and data communications dr. supakorn kungpisdan
TRANSCRIPT
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NETE0510 1
NETE0510Communication Media and
Data Communications
Dr. Supakorn Kungpisdan
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NETE0510 2
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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NETE0510 3
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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NETE0510 4
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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NETE0510 5
Evaluation Criteria
Assignment: 30%Midterm Exam: 30%Final Exam: 40%
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NETE0510 6
Data Communications: Past to Future
Supakorn Kungpisdan
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NETE0510 7
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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NETE0510 8
Data Communications
Data VS Information Data Communications enables consumers or businesses
to communicate in some form or fashion
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NETE0510 9
Data Communications Network
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NETE0510 10
Data Communications Network (cont’d)
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NETE0510 11
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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NETE0510 12
Brief History of Communications
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NETE0510 13
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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NETE0510 14
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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NETE0510 15
Data Communications Takes the Lead
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NETE0510 16
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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NETE0510 17
Data Communications Takes the Lead (cont’d)
64kbps/1.544Mbps
44.736Mbps
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NETE0510 18
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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NETE0510 19
Application Demand for Bandwidth
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NETE0510 20
Application Demand for Bandwidth (cont’d)
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NETE0510 21
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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NETE0510 22
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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NETE0510 23
S-Curves of Technological Evolution
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NETE0510 24
FR, ATM, and IP Technology Enablers
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NETE0510 25
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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NETE0510 26
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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NETE0510 27
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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NETE0510 28
From Centralized to Distributed Networks
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NETE0510 29
Flattening
Moving from hierarchical structure to a distributed structure
In other words, fewer network elements but greater logical interconnection
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NETE0510 30
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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NETE0510 31
The Proliferation of LAN Switching
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NETE0510 32
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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NETE0510 33
Private and Virtual Private Networks (VPNs)
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NETE0510 34
VPNs
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NETE0510 35
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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NETE0510 36
Questions?
Next Lecture
Understanding the Standards
and Their Makers