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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, 2012 Edition Chapter 8


Objectives overview1
Objectives Overview

See Page 313

for Detailed Objectives

Discovering Computers Fundamentals, 2012 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, 2012 Edition Chapter 8


Communications1
Communications

Pages 314 – 315

Figure 8-1

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Uses of computer communications
Uses of Computer Communications

Page 316

Discovering Computers Fundamentals, 2012 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, 2012 Edition Chapter 8


Uses of computer communications2
Uses of Computer Communications

Pages 317 - 318

Discovering Computers Fundamentals, 2012 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, 2012 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, 2012 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:

Page 320

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Uses of computer communications6
Uses of Computer Communications

Page 320

Figure 8-5

Discovering Computers Fundamentals, 2012 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, 2012 Edition Chapter 8


Uses of computer communications8
Uses of Computer Communications

Page 321

Figure 8-6

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Uses of computer communications9
Uses of Computer Communications

Pages 321 - 322

Discovering Computers Fundamentals, 2012 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, 2012 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, 2012 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, 2012 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, 2012 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, 2012 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

Page 326

Figure 8-11

Discovering Computers Fundamentals, 2012 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, 2012 Edition Chapter 8


Networks6
Networks

Page 328

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Network communications standards
Network Communications Standards

Pages 329 - 330

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Network communications standards1
Network Communications Standards

Page 329

Discovering Computers Fundamentals, 2012 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, 2012 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

Pages 329 - 330

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Network communications standards4
Network Communications Standards

Page 330

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Communications software
Communications Software

  • Communications softwareconsists of programs that:

Page 330

Discovering Computers Fundamentals, 2012 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, 2012 Edition Chapter 8


Communications over the telephone network1
Communications Over the Telephone Network

Pages 331 - 332

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Communications over the telephone network2
Communications Over the Telephone Network

Page 332

Figure 8-16

Discovering Computers Fundamentals, 2012 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, 2012 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, 2012 Edition Chapter 8


Communications devices2
Communications Devices

Page 333

Figure 8-17

Discovering Computers Fundamentals, 2012 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, 2012 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, 2012 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, 2012 Edition Chapter 8


Home networks
Home Networks

  • Home networks provide computers with the following capabilities:

Page 336

Discovering Computers Fundamentals, 2012 Edition Chapter 8


Home networks1
Home Networks

Page 337

Figure 8-21

Discovering Computers Fundamentals, 2012 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, 2012 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, 2012 Edition Chapter 8


Wireless transmission media
Wireless Transmission Media

Page 341

Discovering Computers Fundamentals, 2012 Edition Chapter 8


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Video: Got Your Video Right Here

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Discovering Computers Fundamentals, 2012 Edition Chapter 8


Summary
Summary

Page 342

Discovering Computers Fundamentals, 2012 Edition Chapter 8