1. Networks in our daily life

2. Define network topologies and representations
Lesson Objectives:
Define network topologies and representations
Understand cabling and media
Understand UTP cabling
Differentiate between different types of cabling

3. 1. Network Topology

4. Network Topology
Network topology is the arrangement of the various elements (links, nodes, etc.) of a communication network.

5. (Assign IP address for each device manually)
Group Activity
(List – Draw – Share)
List all the devices that can access internet at school ?
(Assign IP address for each device manually)
Draw the network topology of school network.
Share your drawing with your class mates ..

6. 2. Cabling & media

7. Types of Network Media Copper wires within cables
Glass or plastic fibers (Fiber-optic cable)
Wireless transmission

8. Criteria to choose Network Media
Distance media can successfully carry a signal
Environment in which media is to be installed
Amount of data and Speed at which it must be transmitted
Cost of media and installation

9. Common network cables
Twisted-pair
Coaxial cable
Fibre-optic

10. Cabling and media Modern networks primarily use three types of media.
Twisted pair - TP most homes and schools are wired with twisted-pair copper cable. it is cheap in comparison to other types of cabling
Coaxial Cable: constructed with copper or aluminum. cable television companies use it to provide services and also used by satellite communication System.
Fibre-optic cable: made of glass or plastic, have very high bandwidth to carry large amount of data .telecom companies use it.

11. Twisted-pair cables Limitations
Data over copper cables are sensitive to electromagnetic interference (EMI). Which reduces the data throughput rate that cable can provide.
Microwave ovens and fluorescent light fixtures are sources of EMI.
Cross talk occurs when cables are bundled together for long lengths.
Cross talk reduce the data-carrying capacity of the medium.
consist of one or more pairs of insulated copper wires. They are twisted together and housed in a protective jacket.

12. What do think… which cable is best?!
Types of twisted-pair cables
Unshielded twisted-pair (UTP) – This is the most commonly encountered type of network cable in many areas.
2- Shielded cables (STP) – These are used almost exclusively in Europe
What do think… which cable is best?!

13. Now … which cable is best?!
Comparison between UTP & STP – Book Activity P-72
Very expensive
Not flexible
Have additional requirements
Difficult to work with
Most common
Inexpensive
High bandwidth
Easy to install
Best for factories. Why?
Shielded Twisted Pairs
Unshielded Twisted Pairs
Now … which cable is best?!

14. Do the colours matter?
Two standards are implemented in : T568A/T568B

15. Sending data on UTP cabling
Switch
Router
Hub
Server

16. Please read page 82 & Answer the following questions
Sending data on UTP cabling
Self Learning
Please read page 82 & Answer the following questions

17. Class Activity
Fill in the blank with Cable TV and Satellite cables or Fiber-optic cables
…………………..………It used by cable television companies
………………………….transmit data using pulses of light.
……………………….…carries data in the form of electrical signals.
………………………….It is a good choice to extend networks from one building to another.
………………………… harder to install, troubleshoot and costly.
………………………… best solution for outdoor and resist environmental changes.

18. Class Activity
Fill in the blank with Cable TV and Satellite cables or Fiber-optic cables
…………………..………It used by cable television companies
………………………….transmit data using pulses of light.
……………………….…carries data in the form of electrical signals.
………………………….It is a good choice to extend networks from one building to another.
………………………… harder to install, troubleshoot and costly.
………………………… best solution for outdoor and resist environmental changes.
Cable TV and satellite cables
Fibre-optic cables
Cable TV and satellite cables
Fibre-optic cables
Cable TV and satellite cables
Fibre-optic cables

19. Book Activity P-84 Fiber Optic – to avoid electrical interference
Fiber Optic – due to long distance
Ethernet– due to short distance-LAN