Mr. Thilak de Silva. BSc. Eng., MSc, CEng, FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA) M.Sc. in IT - Year 1 Semester II

 About ACN.  Reference Books.  Data Communication.  Computer Networks. M.Sc. in IT - Year 1 Semester II

 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

Forouzan - TCP/IP protocol suite Forouzan - Data Communication and Networking Tanenbaum – Computer Networks Top Down Network Design - CISCO William Stallings- Data and computer communications Hasall – Data communications, computer networks and open systems Images – Amazon.com

 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

 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

 Transporting data/information from one place to another.  Data is in Memory.  A series of  Originates from applications.  Data are converted to Signals when travelling. M.Sc. in IT - Year 1 Semester II

ID for data, ID for destination M.Sc. in IT - Year 1 Semester II Coding DataSecurity Encryption Compressio n Dividing to sessions Application Handle errors Convert data to signal Transmission media Error correction

 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

 Signals travel through transmission media.  Speed of the signal depends on transmission media.  Frequency can be in Hz, MHz, KHz, GHz, or THz. M.Sc. in IT - Year 1 Semester II SignalTransmission mediaSpeed Electrical signalsCopper 2*10 ms Optical signalsFiber 3*10 ms Free Space Radio 3*10 ms

M.Sc. in IT - Year 1 Semester II Source :

 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

 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

 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

 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 Computer Networks

 You will learn about,  Behavior of LAN’s and Standards,  Ethernet M.Sc. in IT - Year 1 Semester II

 You will learn about,  Core Networks and  Access Networks M.Sc. in IT - Year 1 Semester II Core Network Access Network

 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

 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

 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

 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.

 MPLS (Multi Protocol Label Switching) etc, Standard Bodies  ITUT  IEEE etc M.Sc. in IT - Year 1 Semester II