1 of 8

TRANSMISSION MEDIA

Wired and wireless

2 of 8

TRANSMISSION MEDIA

​

​

  • A computer network is a system of connected devices that can communicate with each other. This means that information can be shared between these devices. To have a network, you need at least two devices that are connected.

​

  • Once the devices are connected, they can start exchanging information. The data that is transferred from one device to another is called transmission media. This is the medium or method by which the data travels from one device to another. There are different types of transmission media, such as cables, wireless signals, infrared signals, and more.

3 of 8

FORMS OF TRANSMISSION

  • There are two form of transmitting data:
    • Wired
    • Wireless

​

Activity 1: �Brainstorm what devices you have at home

Which devices use wireless and which use wired?

Leave these until the end to see if you were correct!

4 of 8

WIRED TRANSMISSION MEDIA

  • Twisted Pair:
  • a simple type of cabling made up of two copper wires twisted around each other (this helps to stop interference)
  • It has a data transfer rate of up to Gbps
  • It is cheaper than other forms of wired media

​

  • These are used to connect devices together,�including desktops and wireless access points�to switches

5 of 8

WIRED TRANSMISSION MEDIA

  • Coaxial Cable
  • Has a central copper cable that transmits data
  • It is surrounded by a shield of copper braiding which protects the central cable for interference
  • Coaxial cable is more expensive than twisted �pair.

​

  • These are mainly found in factories and �can be found in the home.��What might these be used for?

6 of 8

WIRED TRANSMISSION MEDIA

  • Fibre Optic
  • is made up of fine strands of glass that carry pulses of light.
  • The pulses of light carry the data being transferred.
  • More secure than copper cabling as any break in this cable can be detected.
  • It does not suffer from interference
  • Can transmit data at very high speeds up to 100 tbps
  • Commonly used to connect buildings together in a LAN
  • It is very expensive

7 of 8

WIRELESS TRANSMISSION MEDIA

8 of 8

PROTOCOLS

8

TCP

Takes care of the communication between the computers. It is responsible for putting an address on the data packets and receiving the data packets over the internet.   

HTTP

Takes care of the communication between a webserver and a web browser.  

FTP

Is a protocol that allows computers and devices to send and receive large files across a network.  

HTTPS

Takes care of secure communication between a web server and a web browser.  

IP

Is responsible for the breaking data down into small packets before they can be sent over a network and for putting them back together again when they arrive at the destination.