Networks in our daily life

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

1. Network Topology

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

(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 ..

2. Cabling & media

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

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

Common network cables Twisted-pair Coaxial cable Fibre-optic

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.

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.

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?!

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?!

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

Sending data on UTP cabling Switch Router Hub Server

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

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.

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

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