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

Introduction to ACNLecture o1

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.


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


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

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.


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


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.


ID for data,ID for destination

How data is transmitted?


CodingData Securit

yEncryption

Compression

Dividing to sessions

Application

Handle errors

Convert data to signal

Transmission media

Error correction

Signals

All Signals travels as Electro Magnetic waves.

There are three main types of signals▪Electrical signals▪Optical signals▪Transmitting in Free Space


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 -

2012

Signal Transmission media

Speed

Electrical signals Copper 2*10 ms

Optical signals Fiber 3*10 ms

Free Space Radio 3*10 ms

8 -1

10 -1

10 -1

Electro Magnetic Spectrum


Source : http://content.answcdn.com/main/content/img/oxford/Oxford_Photo/0198662718.electromagneticspectrum.2.jpg

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.


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


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.


Computer Networks

LAN (Local Area Networks)

You will learn about, Behavior of LAN’s and Standards, Ethernet


WAN (Wide Area Networks) You will learn about,

Core Networks and Access Networks


Core Network

Access Network

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


Thank You…


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

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