Transcript Advanced Computer Networks (ACN)

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
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About ACN.
Reference Books.
Data Communication.
Computer Networks.
M.Sc. in IT - Year 1 Semester II - 2012
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Assignment 01 – After 4 weeks of lecture
Assignment 02 – After 8 weeks of lecture
Assignment 03 – After 12 weeks of lecture
Final examination
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Assignment documentations – IEEE Standard
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M.Sc. in IT - Year 1 Semester II - 2012
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
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To introduce the subject content of Advanced
Computer Networks (545).
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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
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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
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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
Data
Application
Security
Coding
Encryption
ID for data,
ID for
destination
Handle
errors
Error
correction
Dividing to
sessions
Convert data
to signal
Compressio
n
Transmission
media
M.Sc. in IT - Year 1 Semester II - 2012
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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
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Signals travel through transmission media.
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Speed of the signal depends on transmission
media.
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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
Source :
http://content.answcdn.com/main/content/img/oxford/Oxford_Photo/0198662718.electromagneticspectrum.2.jpg
M.Sc. in IT - Year 1 Semester II - 2012
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AM Radio – in KHz range
FM Radio/TV – in MHz range
Mobile/satellite/Microwave – in GHz range
Optical signals – in THz range
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Optical signal range is divided in to two,
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▪ Visible range (from Violet to Red)
▪ Invisible range (Infrared - IR , ultraviolet – UV)
M.Sc. in IT - Year 1 Semester II - 2012
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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
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PAN (Personnel area Networks)
 For private connections
 Eg :- data transmission between a Mobile phone
and a Notebook
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LAN (Local Area Networks)
 For a small geographical area
 Speed - Ethernet
M.Sc. in IT - Year 1 Semester II - 2012
Computer Networks
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MAN (Metropolitan Area Networks)
 Several KM of area
 Fiber optic networks
 Speed – Metro Ethernet
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WAN (Wide Area Networks)
 For a large area
 A public network.
M.Sc. in IT - Year 1 Semester II - 2012
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You will learn about,
 Behavior of LAN’s and Standards,
 Ethernet
M.Sc. in IT - Year 1 Semester II - 2012
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You will learn about,
 Core Networks and
 Access Networks
Core
Network
Access Network
M.Sc. in IT - Year 1 Semester II - 2012
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Access Network is from customer premises to
service providers’ network.
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Access Networks are divided as,
 Fixed Access Networks and
 Mobile Access Networks
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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
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Copper
 Initially 4 KHz
 Has used broadband technology to broaden the
bandwidth (ADSL)
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Fiber
 FTTH (Fiber To The Home)
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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
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FDMA – (Frequency Division Multiple Access)
TDMA – (Time Division Multiple Access)
CDMA – (Code Division Multiple Access)
Mobile Access Networks
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Mobile generations
M.Sc. in IT - Year 1 Semester II - 2012
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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.
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MPLS (Multi Protocol Label Switching) etc,
Standard Bodies
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ITUT
IEEE etc
M.Sc. in IT - Year 1 Semester II - 2012
M.Sc. in IT - Year 1 Semester II - 2012