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

1. Mr. Thilak de Silva. BSc. Eng., MSc, CEng, FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA) Introduction to ACNLecture o1Advanced Computer Networks (ACN) 545 M.Sc. in IT - Year 1 Semester II - 2012

2. Today's Agenda • About ACN. • Reference Books. • Data Communication. • Computer Networks. M.Sc. in IT - Year 1 Semester II - 2012

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 M.Sc. in IT - Year 1 Semester II - 2012

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 M.Sc. in IT - Year 1 Semester II - 2012

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. M.Sc. in IT - Year 1 Semester II - 2012

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 M.Sc. in IT - Year 1 Semester II - 2012

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. M.Sc. in IT - Year 1 Semester II - 2012

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 M.Sc. in IT - Year 1 Semester II - 2012

9. Signals • All Signals travels as Electro Magnetic waves. • There are three main types of signals • Electrical signals • Optical signals • Transmitting in Free Space M.Sc. in IT - Year 1 Semester II - 2012

10. Signals travel through transmission media. • Speed of the signal depends on transmission media. • Frequency can be in Hz, MHz, KHz, GHz, or THz. 8 -1 10 -1 10 -1 M.Sc. in IT - Year 1 Semester II - 2012

11. Electro Magnetic Spectrum Source : http://content.answcdn.com/main/content/img/oxford/Oxford_Photo/0198662718.electromagneticspectrum.2.jpg M.Sc. in IT - Year 1 Semester II - 2012

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) M.Sc. in IT - Year 1 Semester II - 2012

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 M.Sc. in IT - Year 1 Semester II - 2012

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. M.Sc. in IT - Year 1 Semester II - 2012

16. LAN (Local Area Networks) • You will learn about, • Behavior of LAN’s and Standards, • Ethernet M.Sc. in IT - Year 1 Semester II - 2012

17. WAN (Wide Area Networks) • You will learn about, • Core Networks and • Access Networks Core Network Access Network M.Sc. in IT - Year 1 Semester II - 2012

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 M.Sc. in IT - Year 1 Semester II - 2012

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) M.Sc. in IT - Year 1 Semester II - 2012

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 M.Sc. in IT - Year 1 Semester II - 2012

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 M.Sc. in IT - Year 1 Semester II - 2012

23. Thank You… M.Sc. in IT - Year 1 Semester II - 2012