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Introduction to ACN Lecture o1 Advanced Computer Networks (ACN) 545

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Introduction to ACNLecture o1Advanced Computer Networks (ACN) 545 . Mr. Thilakde Silva. BSc. Eng., MSc, CEng, FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA) – PowerPoint PPT presentation

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Title: Introduction to ACN Lecture o1 Advanced Computer Networks (ACN) 545


1
Introduction to ACNLecture o1Advanced Computer
Networks (ACN) 545
  • Mr. Thilak de Silva.
  • BSc. Eng., MSc, CEng, FIE(SL), FIET(UK),
    CITP(UK), MBCS(UK), MIEEE (USA)

2
Today's Agenda
  • About ACN.
  • Reference Books.
  • Data Communication.
  • Computer Networks.

3
Assessment Criteria
  • Assignment 01 After 4 weeks of lecture
  • Assignment 02 After 8 weeks of lecture
  • Assignment 03 After 12 weeks of lecture
  • Final examination
  • Assignment documentations IEEE Standard

4
Reference Books
Top Down Network Design - CISCO
Forouzan - TCP/IP protocol suite
Tanenbaum Computer Networks
Hasall Data communications, computer networks
and open systems
Forouzan - Data Communication and Networking
William Stallings- Data and computer
communications
Images Amazon.com
5
Session Outcomes
  • To introduce the subject content of Advanced
    Computer Networks (545).
  • At the end of the session you will get a brief
    idea about data communication and computer
    networks.

6
ACN- Advanced Computer Networks
  • You will be learning about two major parts in
    Networking in this lecture series.
  • Data Communication
  • Data transmission
  • Signals
  • Transmission media and characteristics
  • Computer Networking
  • Networks (LAN,MAN,WAN,PAN)
  • Core and Access Networks (WAN)
  • Standard Bodies

7
Data Communication
  • Transporting data/information from one place to
    another.
  • Data is in Memory.
  • A series of - 1000101010101110.
  • Originates from applications.
  • Data are converted to Signals when travelling.

8
How data is transmitted?
Data
Security
Application

Coding
Encryption
ID for data, ID for destination
Dividing to sessions
Compression
Error correction
Convert data to signal
Transmission media
Handle errors
9
Signals
  • All Signals travels as Electro Magnetic waves.
  • There are three main types of signals
  • Electrical signals
  • Optical signals
  • Transmitting in Free Space

10
  • Signals travel through transmission media.
  • Speed of the signal depends on transmission
    media.
  • Frequency can be in Hz, MHz, KHz, GHz, or THz.

Signal Transmission media Speed
Electrical signals Copper 210 ms
Optical signals Fiber 310 ms
Free Space Radio 310 ms
8
-1
10
-1
10
-1
11
Electro Magnetic Spectrum
Source http//content.answcdn.com/main/content/i
mg/oxford/Oxford_Photo/0198662718.electromagnetics
pectrum.2.jpg
12
Electro Magnetic Spectrum
  • AM Radio in KHz range
  • FM Radio/TV in MHz range
  • Mobile/satellite/Microwave in GHz range
  • Optical signals in THz range
  • Optical signal range is divided in to two,
  • Visible range (from Violet to Red)
  • Invisible range (Infrared - IR , ultraviolet
    UV)

13
Transmission Media
  • Guided Media (copper, fiber)
  • Unguided Media (Radio)
  • Characteristics of transmission media
  • Why we learn?
  • To identify and eliminate errors occurring when
    transmitting data and to make further decisions.

M.Sc. in IT - Year 1 Semester II - 2012
14
Computer Networks
  • PAN (Personnel area Networks)
  • For private connections
  • Eg - data transmission between a Mobile phone
    and a Notebook
  • LAN (Local Area Networks)
  • For a small geographical area
  • Speed - Ethernet

15
Computer Networks
  • MAN (Metropolitan Area Networks)
  • Several KM of area
  • Fiber optic networks
  • Speed Metro Ethernet
  • WAN (Wide Area Networks)
  • For a large area
  • A public network.

16
LAN (Local Area Networks)
  • You will learn about,
  • Behavior of LANs and Standards,
  • Ethernet

17
WAN (Wide Area Networks)
  • You will learn about,
  • Core Networks and
  • Access Networks

Core Network
Access Network
18
WAN (Wide Area Networks)
  • Access Network is from customer premises to
    service providers network.
  • Access Networks are divided as,
  • Fixed Access Networks and
  • Mobile Access Networks
  • Fixed Access Networks are further divided as,
  • Fixed Wired Access Networks and
  • Fixed Warless Access Networks

19
Fixed Wired Access Networks
  • Copper
  • Initially 4 KHz
  • Has used broadband technology to broaden the
    bandwidth (ADSL)
  • Fiber
  • FTTH (Fiber To The Home)
  • Copper and Fiber
  • FTTN/FTTC (Fiber To The Node/ Fiber To The
    Cabinet)
  • FTTB (Fiber To The Building)

20
Fixed Wireless Access Networks
  • FDMA (Frequency Division Multiple Access)
  • TDMA (Time Division Multiple Access)
  • CDMA (Code Division Multiple Access)
  • Mobile Access Networks
  • Mobile generations

21
Core Networks
  • Requires high bandwidth
  • Use fiber optic cables
  • By using WDM (Wave length Division Multiplexing)
    one fiber can act as many fibers.
  • Data should be multiplexed before transmitting
    through fiber or can get data as an Ethernet and
    transmit.
  • Can share bandwidth using MPLS.

22
Core Network Technologies
  • MPLS (Multi Protocol Label Switching) etc,
  • Standard Bodies
  • ITUT
  • IEEE etc

23
Thank You
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