Introduction to ACN Lecture 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

About ACN.Reference Books.Data Communication.Computer Networks.

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

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

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

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 - 2012

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

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

ID for data,ID for destination

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

CodingData Securit

yEncryption

Compression

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 - 2012

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

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

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

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

Guided Media (copper, fiber)Unguided Media (Radio)Characteristics of transmission

mediaWhy 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

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

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

Computer Networks

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

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

You will learn about, Core Networks and Access Networks

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

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 -

2012

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

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

Requires high bandwidthUse fiber optic cablesBy 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 - 2012

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