Computers Are Your Future Eleventh Edition * 07/16/96 Computers Are Your Future Eleventh Edition Chapter 8: Wired & Wireless Communication مهم جدا Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wired & Wireless Communication * 07/16/96 Wired & Wireless Communication This is Figure 8.26. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Moving Data: Bandwidth and Modems * 07/16/96 Moving Data: Bandwidth and Modems Communications is the process of sending and receiving messages electronically between two points. A communications channel is a path used to send and receive messages. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Network Fundamentals LAN WAN Links computers in a limited area * 07/16/96 Network Fundamentals LAN Links computers in a limited area WAN Links computer systems a few miles or thousands of miles apart The Internet is the largest WAN Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Moving Data: Bandwidth and Modems * 07/16/96 Moving Data: Bandwidth and Modems Analog signals are continuous waves. Digital signals are discontinuous, discrete pulses. Converters translate signals. This is Figure 8.1. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Moving Data: Bandwidth and Modems * 07/16/96 Moving Data: Bandwidth and Modems Bandwidth is the maximum amount of data transmitted through a communication channel at one time. Throughput is the actual amount of data transmitted. Broadband is any transmission that carries several channels to transport data at high speeds. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Moving Data: Bandwidth and Modems * 07/16/96 Moving Data: Bandwidth and Modems A modem is a communication device used to send and receive data. The sender uses modulation to transmit digital signals. The receiver uses demodulation to return signals to digital form. This is Figure 3.3. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Moving Data: Bandwidth and Modems * 07/16/96 Moving Data: Bandwidth and Modems This is Figure 8.4. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Moving Data: Bandwidth and Modems * 07/16/96 Moving Data: Bandwidth and Modems Types of modems Analog Digital subscriber line (DSL) Cable Integrated Services Digital Network (ISDN) Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wired Transmission Media * 07/16/96 Wired Transmission Media Twisted pair wire is copper wire used for telephone and data communication. Two pairs of interweaved wires This is Figure 8.6. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wired Transmission Media * 07/16/96 Wired Transmission Media Coaxial cable consists of copper wire surrounded by insulation. This is Figure 8.7. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wired Transmission Media * 07/16/96 Wired Transmission Media Fiber-optic cable consists of thin strands of glass or plastic that carry data through pulses of light. This is Figure 8.8. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wireless Transmission Media * 07/16/96 Wireless Transmission Media Infrared is a wireless transmission medium that carries data through the air using light beams. Use an IrDA port to enable data transfer. This is Figure 8.9. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wireless Transmission Media * 07/16/96 Wireless Transmission Media Radio transmission through the air as radio frequency or radio waves. Bluetooth radio transmission enables devices communicate wirelessly. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wireless Transmission Media * 07/16/96 Wireless Transmission Media Satellites are microwave relay stations in space that transmit data through microwave signals. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wired and Wireless Applications * 07/16/96 Wired and Wireless Applications Internet telephony Videoconferencing transmits sound and video images to people in different locations using: Video camera Skype software This is Figure 8.26. Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *

Wired and Wireless Applications * 07/16/96 Wired and Wireless Applications Facsimile transmission (fax) transmits documents over a telephone line or the Internet Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall *