1. Chapter 9 Installing Communication Devices Prepared by: Khurram N. Shamsi

2. What is communication? Communication is the process of transferring information from one party to another in such a way that the other party understands it.

3. Types of communication Serial Communication Parallel Communication

4. Modes of Communication Simplex  One party send, the other receives (one way communication). Half duplex  One party communicate at one time. Full duplex  Both parties can communicate simultaneously.

5. Communication Media Communication media can broadly be classified into two categories: Wired Media  Coaxial Cable  Fiber Optics Cable

6. Wireless Media Microwave Communication Satellite Communication Bluetooth

7. Wired Media Coaxial Cable Coaxial Cable is a high frequency transmission cable that replaces the multiple wires of telephone lines with a single solid copper core. It is used to deliver television signals as well as to connect computers in a network. Fiber Optics Cable  Fiber Optics transmits data as a pulse of light through tiny tubes of glass.  They transmit information using beams of light at light speeds instead of pulses of electricity, making the transmission faster than copper cable.

8. Wireless Media Microwave Communication  Microwave communication uses high-frequency radio waves.  This technology is sometimes referred as Line-of-Sight communication because the radio waves travel in a straight line.  Microwave is a good medium for sending data between building in a city or on a large college campus. Satellite Communication  Satellite communication uses satellites orbiting about 22,000 miles above the earth as microwave relay stations.  The satellites can be used to send large volumes of data.  Their major drawback is that bad weather can sometimes interrupt the flow of data.

9. Wireless Media Bluetooth  Bluetooth is a standard communications protocol primarily designed for low power consumption.  It works in a short range based on low cost transceiver microchips in each device.  Bluetooth makes it possible for these devices to communicate with each other when they are in range.  Because the devices use a radio communications system, they do not have to be in line of sight of each other, they can even be far apart if the transmission has sufficient power.

10. Communication Process Initial communication networks used existing phone network for communication. Most phone lines are designed to transmit analog information. The computers work in digital form. So a converter is needed for transmission. This converter is MODEM that performs modulation and demodulation of data.

11. MODEM MODEM is the short for MOdulator-DEModulator. A modem transforms (modulates) digital information into an analogue signal that can be sent across a telephone line. It also demodulates an analogue signal it receives from the telephone line, converting the information contained in the signal back into digital information.

12. Modulation It is the process of converting digital signal into analog signal. Types of modulation:  Amplitude modulation (AM).  Frequency modulation (FM).  Phase modulation (PM).

13. Types of Networks Local area network (LAN). Wide area network (WAN). Metropolitan area network (MAN).

14. Topology Topology is the geometrical arrangement of computers in a network. Types of topology:  Star topology  Bus topology  Ring topology  Hybrid topology

15. Network Communication Devices Modem Network Interface Card (NIC) Switch Router Bridge HUB Repeater Gateway

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