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1. If you SPEAK to someone over the internet you will use VOiP (Voice Over Internet Protocol) as well as a CODEC. You can see what this is on video number 1. The chances are that at home you use at least one device to access the internet using WIRELESS technology. At school you use WIRED technology to access the network and the Internet.

2. Transmission Modes

   • Simplex
     • Simplex is easy to remember. It is data transmitted in one direction only. Think about your TV remote. You point it at your telly and click a button to get the TV to do something. Data is transmitted to your TV. This data is received by your TV which then carries out the request like turn the volume up or change the channel.
   • Half Duplex
     • This is when devices can communicate with each other but only one at a time. For example a police radio. You click a button to speak and then have to release it to listen to the response.
   • Full Duplex
     • Full duplex is like your telephone. You and your friends can speak to each other at the same time. The data channel allows 2 way communication.