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Your Interactive Guideto the Digital World

Discovering

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Objectives Overview

Discuss the purpose of the

components required forsuccessful communications

and identify various sendingand receiving devices

Discovering Computers 2012: Chapter 9 2See Page 459

for Detailed Objectives

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Objectives Overview

Describe commonly

usedcommunications

devices

Discovering Computers 2012: Chapter 9 3See Page 459

for Detailed Objectives

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Communications

• Computer communications describes a process in

which two or more computers or devices transfer

data, instructions, and information

Discovering Computers 2012: Chapter 9 4Page 460

Sending deviceCommunications

channelReceiving device

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Communications

Discovering Computers 2012: Chapter 9 5Pages 460 – 461

Figure 9-1

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Communications Devices

• A communications device is any type of hardware

capable of transmitting data, instructions, and

information between a sending device and a

receiving device

• A dial-up modem converts signals between analog

and digital

Discovering Computers 2012: Chapter 9 6Page 485

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Communications Devices

• A digital modem sends and receives data and

information to and from a digital line

Discovering Computers 2012: Chapter 9 7Page 486

DSL

modem

Cable

modem

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Communications Devices

• A wireless modem uses the cell phone network to

connect to the Internet wirelessly from a

notebook computer, a smart phone, or other

mobile device

Discovering Computers 2012: Chapter 9 9Page 487

Figure 9-28

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Communications Devices

• A network card enables

a computer or device to

access a network

• Available in a variety ofstyles

• Wireless network cards

often have an antenna

Discovering Computers 2012: Chapter 910Page 487

Figure 9-29

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Communications Devices

• A wireless access point is a central communications

device that allows computers and devices to transfer data

wirelessly among themselves or to a wired network

Discovering Computers 2012: Chapter 9 11Page 487

Figure 9-30

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Communications Devices

• A router connects

multiple computers or

other routers together

and transmits data to itscorrect destination on a

network

• Many are protected by

a hardware firewall

Discovering Computers 2012: Chapter 912Page 488

Figure 9-31

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Communications Devices

• A hub or switch connects several devices in a

network together

Discovering Computers 2012: Chapter 9 13Pages 488 – 489

Figure 9-32

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Summary

Various

communicationsdevices, media, and

procedures

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Your Interactive Guideto the Digital World

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Chapter 9 Complete