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Objectives Overview. See Page 313 for Detailed Objectives. Objectives Overview. See Page 313 for Detailed Objectives. Communications. Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information. Page 314.

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objectives overview
Objectives Overview

See Page 313

for Detailed Objectives

Discovering Computers Fundamentals, 2010 Edition Chapter 8

objectives overview1
Objectives Overview

See Page 313

for Detailed Objectives

Discovering Computers Fundamentals, 2010 Edition Chapter 8

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

Page 314

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications1
Communications

Pages 314 – 315

Figure 8-1

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications
Uses of Computer Communications

Click to view Web Link,click Chapter 8, Click Web Link from left navigation,

then click Wikisbelow Chapter 8

Page 316

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications1
Uses of Computer Communications
  • Users can send and receive wireless messages using wireless messaging services

Page 317

Figure 8-3

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications2
Uses of Computer Communications

Click to view Web Link,click Chapter 8, Click Web Link from left navigation,

then click Video Messagingbelow Chapter 8

Pages 317 - 318

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications3
Uses of Computer Communications
  • Wireless Internet access pointsallow people to connect wirelessly to the Internet from home, work, school, and in many public locations

Pages 318 – 319

Figure 8-4

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications4
Uses of Computer Communications
  • A cybercaféis a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customers

Page 319

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications5
Uses of Computer Communications
  • A global positioning system (GPS) 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 GPS receiver’s geographic location
  • GPS receivers are:

Click to view Web Link,click Chapter 8, Click Web Link from left navigation,

then click GPSbelow Chapter 8

Page 320

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications6
Uses of Computer Communications

Page 320

Figure 8-5

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications7
Uses of Computer Communications
  • Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users

Page 321

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications8
Uses of Computer Communications

Page 321

Figure 8-6

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications9
Uses of Computer Communications

Pages 321 - 322

Discovering Computers Fundamentals, 2010 Edition Chapter 8

uses of computer communications10
Uses of Computer Communications
  • Web services enable programmers to create applications that communicate with other remote computers over the Internet or on an internal business network
  • A mashup is a Web application that combines services from two or more sources

Page 322

Discovering Computers Fundamentals, 2010 Edition Chapter 8

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

Page 322

Discovering Computers Fundamentals, 2010 Edition Chapter 8

networks1
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

Page 323

Figure 8-7

Discovering Computers Fundamentals, 2010 Edition Chapter 8

networks2
Networks
  • A metropolitan area network (MAN) connects LANs in a metropolitan area
  • A wide area network (WAN) is a network that covers a large geographical area

Page 324

Figure 8-8

Discovering Computers Fundamentals, 2010 Edition Chapter 8

networks3
Networks
  • The design of computers, devices, and media on a network is sometimes called the network architecture

Client/server network

Peer-to-peer network

Page 325

Figures 8-9 – 8-10

Discovering Computers Fundamentals, 2010 Edition Chapter 8

networks4
Networks
  • P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the Internet

Click to view Web Link,click Chapter 8, Click Web Link from left navigation,

then click P2Pbelow Chapter 8

Page 326

Figure 8-11

Discovering Computers Fundamentals, 2010 Edition Chapter 8

networks5
Networks
  • A network topologyrefers to the layout of the computers and devices in a communications network

Star network

Bus network

Ring network

Pages 326 – 328

Figures 8-12 – 8-14

Discovering Computers Fundamentals, 2010 Edition Chapter 8

networks6
Networks

Page 328

Discovering Computers Fundamentals, 2010 Edition Chapter 8

network communications standards
Network Communications Standards

Pages 329 - 330

Discovering Computers Fundamentals, 2010 Edition Chapter 8

network communications standards1
Network Communications Standards

Click to view Web Link,click Chapter 8, Click Web Link from left navigation,

then click Ethernetbelow Chapter 8

Page 329

Discovering Computers Fundamentals, 2010 Edition Chapter 8

network communications standards2
Network Communications Standards
  • Wi-Fiidentifies any network based on the 802.11 standard that facilitates wireless communication
  • Sometimes referred to as wireless Ethernet

Page 329

Discovering Computers Fundamentals, 2010 Edition Chapter 8

network communications standards3
Network Communications Standards
  • Bluetooth defines how two Bluetooth devices use short-range radio waves to transmit data
  • UWB (ultra-wideband) specifies how two UWB devices use short-range radio waves to communicate at high speeds
  • IrDA transmits data wirelessly via infrared (IR) light waves
  • RFIDuses radio signals to communicate with a tag placed in or attached to an object, animal, or person

Click to view Web Link,click Chapter 8, Click Web Link from left navigation,

then click RFIDbelow Chapter 8

Pages 329 - 330

Discovering Computers Fundamentals, 2010 Edition Chapter 8

network communications standards4
Network Communications Standards

Page 330

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications software
Communications Software
  • Communications softwareconsists of programs that:

Page 330

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications over the telephone network
Communications Over the Telephone Network
  • The public switched telephone network (PSTN) is the worldwide telephone system

Page 331

Figure 8-15

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications over the telephone network1
Communications Over the Telephone Network

Pages 331 - 332

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications over the telephone network2
Communications Over the Telephone Network

Page 332

Figure 8-16

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications devices
Communications Devices
  • A communications deviceis 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

Page 333

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications devices1
Communications Devices
  • A digital modem sends and receives data and information to and from a digital line

Page 333

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications devices2
Communications Devices

Page 333

Figure 8-17

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications devices3
Communications Devices
  • A wireless modemuses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device

Page 334

Figure 8-18

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications devices4
Communications Devices
  • A network cardenables a computer or device to access a network
  • Available in a variety of styles
  • Wireless network cards often have an antenna

Pages 334 – 335

Figure 8-19

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications devices5
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
  • A router connects multiple computers or other routers together and transmits data to its correct destination on a network
  • Many are protected by a hardware firewall

Page 335

Figure 8-20

Discovering Computers Fundamentals, 2010 Edition Chapter 8

home networks
Home Networks
  • Home networks provide computers with the following capabilities:

Click to view Web Link,click Chapter 8, Click Web Link from left navigation,

then click Home Networksbelow Chapter 8

Page 336

Discovering Computers Fundamentals, 2010 Edition Chapter 8

home networks1
Home Networks

Page 337

Figure 8-21

Discovering Computers Fundamentals, 2010 Edition Chapter 8

communications channel
Communications Channel
  • The amount of data that can travel over a communications channel sometimes is called the bandwidth
  • Transmission media carries one or more signals
  • Broadband media transmit multiple signals simultaneously

Pages 337 - 338

Figure 8-22

Discovering Computers Fundamentals, 2010 Edition Chapter 8

physical transmission media
Physical Transmission Media

Twisted-pair cable

Fiber-optic cable

Coaxial cable

Pages 339 - 340

Figures 8-23 – 8-25

Discovering Computers Fundamentals, 2010 Edition Chapter 8

wireless transmission media
Wireless Transmission Media

Click to view Web Link,click Chapter 8, Click Web Link from left navigation,

then click Mobile TVbelow Chapter 8

Page 341

Discovering Computers Fundamentals, 2010 Edition Chapter 8

video got your video right here
Video: Got Your Video Right Here

CLICK TO START

Discovering Computers Fundamentals, 2010 Edition Chapter 8

summary
Summary

Page 342

Discovering Computers Fundamentals, 2010 Edition Chapter 8