1. C021TV-I4-S3

2. ICN : 4. Computer and networks architecture
1. Elementary components of a computer
2. Execution principles of a computer program
3. Data transmission principle
4. Network structuring
Introduction de la semaine 2/2
Présentation du sommaire global de la semaine : apparition progressive des éléments de la liste, puis mise en évidence de la portion concernée par la vidéo.
Mise en évidence = police noire + gras
Nom abrégé de cours - Enseignant

3. bit after bit, byte after byte (serial)
Communicate on a wire
How does information get transferred?
First, let’s consider a wired communication
A printer or a phone with a USB cable for example
Data is transferred
bit after bit, byte after byte (serial)
Transmitter’s memory …
Receiver’s memory
011
Y a aussi des cables paralleles mais de moins en moins
Nom abrégé de cours - Enseignant

4. Transmitting bits on a wire
Each bit is associated with an electrical potential value
0 or 5 volts for example
That voltage is applied on the transmitter’s side
And it is measured on the receiver’s side
How can we know to how many bits of 1 corresponds a millisecond with 5 volts?
Preliminary agreement on the transmission’s frequency

5. Types of wired connectors
Needs for great distances and high frequency
Energy loss (Joule heating)
Various connector types
Coaxial cable (the « cable », the classical TV antenna)
Twisted pair (RJ45, USB, etc.)
Optical fiber
According to length, frequency, output and
interfrency tolerance that is needed

6. Wireless communication
Suppress wire constraints
Deployment, mobility, …
Use electromagnetic waves
Hertzian television, radio, wifi, mobile phones, …
Adressing problem
To whom is the messasge intended?
Enables direct emission towards many receivers

7. Some orders of magnitude
ADSL
USB
Câble
Fibre optique
TNT
Wifi 3G 4G
25 Mb/s
100 Mb/s
1 Gb/s
100 Gb/s
~10 Mb/s
Mb/s
1-10 Mb/s
~100 Mb/s
3 Mo/s
10 Mo/s
100 Mo/s
10 Go/s
~1 Mo/s
1-10 Mo/s
0,1-1 Mo/s
~10 Mo/s
Transferring a PDF document (100ko)
Between 0,01 and 0,1 second towards a USB printer (or in wifi, or in 4G)
10 µs on an optical fiber
Tranferring a Full HD movie (1Go)
0,1 second swith an optical fiber, 5 minutes with ADSL
Full HD video streaming (1Mo/s)
Difficult with Wifi and 3G if reception is bad

8. Pictures
p. 5 : Antenna on town 01.jpg CC-BY-SA-4.0 self via Wikimedia Common