1. COMPUTER COMMUNICATION & NETWORKS Presented by MUTAASA AHMED

2. COMPUTER COMMUNICATION PERSON –TO-PERSON COMMUNICATION Characteristics of communication systems. Examples of communication systems. Transmitting and receiving in communication systems. Computer Networks COMPUTER COMMUNICATION WHAT DO WE NEED TO COMPLETE THE PROCESS OF COMMUNICATION?

3. WHAT IS COMMUNICATION? The act of conveying information for the purpose of creating a shared understanding. People can communicate through word of mouth, signs or facilitated by communication gadgets such as computers or telephones

4. CHARACTERISTICS OF COMMUNICATION SYSTEMS Must be a Sender and Receiver A protocol is a set of rules which governs the transfer of data between computers. Protocols allow communication between computers and networks. Handshaking is used to establish which protocols to use. Handshaking controls the flow of data between computers

5. Protocols will determine the speed of transmission, error checking method, size of bytes, and whether synchronous or asynchronous Examples of protocols are: token ring, CSMA/CD (Carrier Sense Multiple Access/Collision Detection), TCP/IP CHARACTERISTICS OF COMMUNICATION SYSTEMS

6. 5 BASIC COMPONENTS Every communication system has 5 basic requirements Data Source (where the data originates) Transmitter (device used to transmit data) Transmission Medium (cables or non cable) Receiver (device used to receive data) Destination (where the data will be placed)

7. 5 BASIC COMPONENTS

8. TRANSMISSION MEDIA & SPEED Bandwidth: The amount of data which can be transmitted on a medium over a fixed amount of time (second). It is measured on Bits per Second or Baud Bits per Second (bps): A measure of transmission speed. The number of bits (0 0r 1) which can be transmitted in a second Baud Rate: Is a measure of how fast a change of state occurs (i.e. a change from 0 to 1)

9. NETWORK OR COMMUNICATION DEVICES To complete the communication process Repeaters – amplify the signal Routers – to route the signal Switches – intelligent analysis Bridges – connect two networks together Cables Gateways – gateway to the network

10. COMMUNICATION DEVICES Communication devices are peripheral devices used for communication between computers and other devices. Machines that assist in transmission of data It’s worthy noting that learning about network types remains incomplete unless we get to know the devices that help in communication between computers and devices.

11. NETWORKING PROTOCOLS A Protocol is a set rules that governs the communication between two or more devices. ISO (International Standards Organisation) has standardised all communication protocols such that devices and software developed by different manufacturers can communicate with ease

12. PROTOCOLS Protocols define format, order of messages sent and received amongst communication entities, and actions taken on message transmission and receipt

13. COMMUNICATION DEVICES WHAT ARE THEY???? WHAT DO THEY DO?????