Introduction to ACN Lecture o 1 Advanced Computer

Introduction to ACN Lecture o 1 Advanced Computer Networks (ACN) 545 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 - 2012

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

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

Reference Books Top Down Network Design - CISCO Forouzan - TCP/IP protocol suite Tanenbaum – Computer Networks Forouzan - Data Communication and Networking Hasall – Data communication computer networks and ope systems William Stallings- Data and computer communications Images – Amazon. com M. Sc. in IT - Year 1 Semester II - 2012

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

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

Data Communication �Transporting data/information from one place to another. �Data is in Memory. �A series of - 100010101110. �Originates from applications. �Data are converted to Signals when travelling. M. Sc. in IT - Year 1 Semester II - 2012

How data is transmitted? Application Data Security Coding Encryption ID for data, ID for destination Handle errors Error correction Dividing to sessions Compression Convert data to signal Transmission media M. Sc. in IT - Year 1 Semester II - 2012

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

�Signals travel through transmission media. �Speed of the signal depends on transmission media. Signal Transmission media Speed Electrical signals Copper 2*10 ms-1 Optical signals Fiber 3*10 ms Free Space Radio 3*10 ms 8 10 10 -1 -1 �Frequency can be in Hz, MHz, KHz, GHz, or THz. M. Sc. in IT - Year 1 Semester II - 2012

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

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

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

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

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

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

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

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

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

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

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.

Core Network Technologies �MPLS (Multi Protocol Label Switching) etc, Standard Bodies �ITUT �IEEE etc M. Sc. in IT - Year 1 Semester II - 2012

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