Introduction to computer lec (5)
- 1. Introduction to computer IT-101 Lecture #5 Communication, Telecommunication
- 2. Communication • The exchanging of information, ideas or news is called Communication. • Two way process of reaching mutual understanding in which participants not only exchange information but also create and share meanings.
- 3. Telecommunication • Communication over a distance by cable, telegraph, telephone, or broadcasting is called telecommunication. • Telecommunication is the process of transferring data electronically from one place to another. Data can be transferred using different medium.
- 4. • Basic elements of data communication are: 1. Sender 2. Medium 3. Receiver
- 5. Sender • The sender is the device that sends the data. It is also called Source. Example: • Computer, mobile device etc
- 6. Medium • The medium is the physical path that connects the sender and the receiver. It is used to transmit data. It is also called communication channel. Example: • Copper wire, Fiber-optic cable, air waves etc.
- 7. Receiver • The receiver is the device that accept the data. It is also called sink. Example: • Computer, Printer etc.
- 8. Method of transferring Message
- 9. Computer Networks • Computer network connects two or more autonomous computers. • The computers can be geographically located anywhere.
- 10. PAN,LAN, MAN & WAN PAN(Personal Area Network) • A computer network organized around an individual person. Personal area networks typically involve a mobile computer, a cell phone and/or a handheld computing device such as a PDA.
- 11. PAN,LAN, MAN & WAN LAN(Local Area Network): • Network in small geographical Area (Room, Building or a Campus) is called LAN (Local Area Network) • A network of computers located in the same building or different nearby buildings • Example: – Computer network of a University campus
- 12. PAN,LAN, MAN & WAN MAN (Metropolitan Area Network) • Network in a City is call MAN (Metropolitan Area Network) that is connect the LAN within the city.
- 13. PAN,LAN, MAN & WAN WAN(Wide Area Network) • A network in which computers are separated by great distances, typically across cities or even continents • May consist of several interconnected LANs Example: The network connecting the ATM of a bank located in various cities Internet