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Chapter 10

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Communicating Digital Content

Discovering Computers 2016

Tools, Apps, Devices, and the Impact of Technology

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Objectives Overview

See Page 450

for Detailed Objectives

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Discuss the purpose of the components required for successful communications and identify various sending and receiving devices

Differentiate among LANs, MANs, WANs, and PANs

Differentiate between client/server and peer-to-peer networks

Explain the purpose of communications software

Describe the various network communications standards and protocols

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Objectives Overview

See Page 450

for Detailed Objectives

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Describe various types of communications lines

Describe commonly used communications devices

Discuss different ways to set up and configure a home network

Differentiate among physical transmission media

Differentiate among wireless transmission media

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Communications

  • Digital communications describes a process in which two or more computers or devices transfer data, instructions, and information

Page 450

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Sending device

Transmission media

Receiving device

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Communications

Page 451

Figure 10-1

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Networks

  • A network is a collection of computers and devices connected together via communications devices and transmission media
  • Advantages of a network include:

Pages 452 - 453

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Facilitating communications

Sharing hardware

Sharing data and information

Sharing software

Transferring funds

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Networks

Page 452

Figure 10-2

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Networks

  • A local area network (LAN) is a network that connects computers and devices in a limited geographical area
  • A wireless LAN (WLAN) is a LAN that uses no physical wires

Pages 453 - 454

Figures 10-3 – 10-4

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Networks

  • A metropolitan area network (MAN) connects LANs in a metropolitan area
  • A wide area network (WAN) �is a network that covers a �large geographic area
  • A personal area network �(PAN) is a network that�connects computers and�devices in an individual’s�workspace with wired and�wireless technology

Page 455

Figure 10-5

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Networks

  • The configuration of computers, devices, and media on a network is sometimes called the network architecture

Pages 456 - 457

Figures 10-6 – 10-7

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Client/server network

Peer-to-peer network

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Communications Software

  • Communications software consists of programs and apps that:

Page 457

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Help users establish a connection to another computer, mobile device, or network

Manage the transmission of data, instructions, and information

Provide an interface for users to communicate with one another

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Network Communications Standards �and Protocols

Page 460

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Ethernet

Token ring

TCP/IP

Wi-Fi

Bluetooth

UWB

IrDA

RFID

NFC

LTE

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Network Communications Standards �and Protocols

Pages 460 - 461

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Ethernet is a network standard that specifies no central computer or device on the network (nodes) should control when data can be transmitted

The token ring standard specifies that computers and devices on the network share or pass a special signal (token)

TCP/IP is a network protocol that defines how messages (data) are routed from one end of a network to another

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Network Communications Standards �and Protocols

Page 461

Figure 10-8

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Network Communications Standards �and Protocols

  • Wi-Fi identifies any network based on the 802.11 standard that specifies how two wireless devices communicate over the air with each other
  • LTE is a network standard that defines how high-speed cellular transmissions use broadcast radio to transmit data for mobile communications
  • Bluetooth is a network protocol that defines how two Bluetooth devices use short-range radio waves to transmit data
  • UWB (ultra-wideband) is a network standard that specifies how two UWB devices use short-range radio waves to communicate at high speeds with each other
  • IrDA transmits data wirelessly via infrared (IR) light waves
  • RFID is a protocol that defines how a network uses radio signals to communicate with a tag placed in or attached to an object, an animal, or a person

Pages 462 - 465

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Network Communications Standards �and Protocols

Page 465

Figure 10-9

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Network Communications Standards �and Protocols

Page 466

Figure 10-10

  • NFC (near field communication) is a protocol, based on RFID, that defines how a network uses close-range radio signals to communicate between two devices or objects equipped with NFC technology

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Communications Lines

Pages 466 - 468

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Dedicated line

Cable

DSL

ISDN

FTTP

T-Carrier

ATM

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Communications Lines

Page 466

Table 10-2

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Communications Lines

  • ADSL is a type of DSL that supports faster downstream rates than upstream rates

Page 467

Figure 10-11

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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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

Page 468

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Communications Devices

  • A broadband modem sends and receives data and information to and from a digital line

Pages 468 - 469

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Cable modem

DSL modem

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Communications Devices

Page 469

Figure 10-12

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Communications Devices

  • A wireless modem uses a mobile phone provider’s network to connect to the Internet wirelessly from a computer or mobile device

Page 469

Figure 10-13

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Communications Devices

  • A wireless access point (WAP) is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network

Page 470

Figure 10-14

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Communications Devices

  • A router connects multiple computers or other routers together and transmits data to its correct destination on a network

Page 471

Figure 10-15

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Communications Devices

  • Some routers provide additional functionality:
    • Wireless router
    • Broadband router
    • Broadband wireless �router
    • Mobile broadband �wireless router

Pages 471 – 472

Figure 10-16

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Communications Devices

  • A network card enables a computer or device that does not have built-in networking capability to access a network
  • Available in a variety of styles

Pages 472 - 473

Figure 10-17

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Communications Devices

  • A hub or switch is a device that provides a central point for cables in a network

Page 473

Figure 10-18

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Home Networks

Pages 474 – 475

  • Many home users connect multiple computers and devices together in a home network

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Transmission Media

  • Transmission media carries one or more communications signals
  • Broadband media transmit multiple signals simultaneously
  • The amount of data, instructions, and information that can travel over transmission media sometimes is called the bandwidth
  • Latency is the time it takes a signal to travel from one location to another on a network

Page 476

Figure 10-19

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Physical Transmission Media

Page 477

Table 10-3

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Physical Transmission Media

Pages 477 - 478

Figures 10-20 – 10-22

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Twisted-pair cable

Coaxial cable

Fiber-optic cable

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Wireless Transmission Media

Page 479

Table 10-4

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Wireless Transmission Media

  • Broadcast radio is a wireless transmission medium that distributes radio signals through the air over long distances
  • Cellular radio is a form of broadcast radio that is in wide use for mobile communications

Pages 479 - 480

Figure 10-23

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Wireless Transmission Media

  • Microwaves are radio waves that provide a high-speed signal transmission

Page 482

Figure 10-24

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Wireless Transmission Media

  • A communications satellite is a space station that receives microwave signals from an earth-based station, amplifies it, and broadcasts the signal over a wide area to any number of earth-based stations

Pages 482 - 483

Figure 10-25

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Wireless Transmission Media

  • A GPS (global positioning system) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the receiver’s geographical location

Page 483

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Wireless Transmission Media

Page 484

Figure 10-26

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Summary

Page 485

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Networks and communications technologies

Various types of network architectures and standards and protocols

Communications software

Several types of communications lines and communications devices

How to create a home network

Variety of physical transmission media and wireless transmission media

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Chapter 10 Complete

Chapter 10

​

Communicating Digital Content

Discovering Computers 2016

Tools, Apps, Devices, and the Impact of Technology