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.

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

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

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 - 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

How data is transmitted?

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

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.

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

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

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.

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

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

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

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

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

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

Thank You…

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