Chapter09

Chapter 9 Communications and Networks

Chapter 9 Objectives Discuss the components required for successful communications Identify various sending and receiving devices Describe uses of computer communications List advantages of using a network Differentiate among client/server, peer-to-peer, and P2P networks Describe the various network communications technologies Explain the purpose of communications software Describe various types of lines for communications over the telephone network Describe commonly used communications devices Discuss different ways to set up a home network Identify various physical and wireless transmission media Next

Communications ,[object Object],p. 460 Fig. 9-1 ,[object Object],Next set-top boxes mainframe computers smart phones notebook computers servers Web-enabled PDAs desktop computers Tablet PCs GPS receivers

[object Object],Communications p. 460 Sending device — initiates instruction to transmit data, instructions, or information Next Communications device — connects the communications channel to the receiving device Receiving device — accepts transmission of data, instructions, or information Communications device — connects the sending device to the communications channel Communications channel — media on which data, instructions, or information travel

Uses of Computer Communications ,[object Object],p. 463 Web Internet E-Mail Instant Messaging FTP Newsgroups Chat Rooms Web Folders Fax Machine or Computer Fax/Modem Video Conferencing Next

Uses of Computer Communications ,[object Object],p. 464 Next Internet printing allows you to print to network printer from anywhere in the world Internet telephony enables you to talk to other people over the Internet Sometimes called Voice over IP

Uses of Computer Communications ,[object Object],p. 464 Fig. 9-4 ,[object Object],Next

Uses of Computer Communications ,[object Object],p. 465 Fig. 9-5 ,[object Object],[object Object],[object Object],Next

Uses of Computer Communications ,[object Object],p. 466 Fig. 9-6 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Public Internet Access Points below Chapter 9

Uses of Computer Communications ,[object Object],p. 464 Fig. 9-7 Step 1. GPS satellites orbit Earth. Every thousandth of a second, each satellite sends a signal that indicates its current position to the GPS server. Step 2. A GPS receiver (such as in a car, a PDA, a watch, a handheld device, or a collar) determines its location on Earth by analyzing at least 3 separate satellite signals from the 24 satellites in orbit. Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click GPS below Chapter 9 Click to view video

Uses of Computer Communications ,[object Object],p. 468 Fig. 9-8 ,[object Object],[object Object],[object Object],[object Object],[object Object],Next

Networks ,[object Object],p. 469 Fig. 9-9 ,[object Object],Next

Networks ,[object Object],p. 471 Fig. 9-10 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click LAN below Chapter 9

Networks ,[object Object],p. 472 Fig. 9-11 ,[object Object],[object Object],Next

Networks ,[object Object],p. 473 Fig. 9-14 ,[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click P2P below Chapter 9

Networks ,[object Object],p. 474 Fig. 9-15 ,[object Object],[object Object],[object Object],Next

Networks ,[object Object],p. 475 ,[object Object],[object Object],Token ring technology controls access to network by requiring devices to pass a special signal, called token Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Ethernet below Chapter 9

Networks ,[object Object],p. 476 Fig. 9-18 ,[object Object],[object Object],[object Object],Next

Networks ,[object Object],p. 476 IrDA specification allows data to be transferred wirelessly via infrared light waves Wireless Applications Protocol (WAP) allow wireless mobile devices to access Internet Radio Frequency Identification (RFID) uses radio signals to communicate with a tag placed in an object Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click WAP below Chapter 9 Click to view video

Networks ,[object Object],p. 478 Next Extranet allows customers or suppliers to access part of company’s intranet Typically includes connection to Internet Makes information accessible to employees Internal network that uses Internet technologies

Communications Software ,[object Object],p. 478 Next Programs that help users establish connection to Internet, other network, or another computer Programs that help users manage transmission of data, instructions, and information Programs that provide an interface for users to communicate with one another

Communications Software ,[object Object],p. 479 Fig. 9-20 Step 1. After you start the New Connection Wizard and select Connect to the Internet and Set up my connection manually in the dialog boxes, click Connect using a dial-up modem. Step 2. Enter the name of your Internet service provider. Step 3. Enter your Internet service provider’s telephone number. Step 4. Enter your account information. Step 5. Click the Finish button to create the Internet connection. ,[object Object],Next

Communications Over the Telephone Network ,[object Object],p. 480 Fig. 9-22 ,[object Object],Next

Communications Over the Telephone Network ,[object Object],p. 480 Fig. 9-23 ,[object Object],[object Object],[object Object],Next

Communications Over the Telephone Network ,[object Object],p. 481 Fig. 9-24 ,[object Object],[object Object],Next

Communications Over the Telephone Network ,[object Object],p. 482 Fig. 9-25 ,[object Object],[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click DSL below Chapter 9

Communications Devices ,[object Object],p. 482 Next Common types are dial-up modems, ISDN and DSL modems, cable modems, network cards, wireless access points, routers, and hubs ISDN and DSL modems send and receive data from ISDN and DSL lines

Communications Devices ,[object Object],p. 483 Figs. 9-26–9-27 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Dial-Up Modems below Chapter 9

Communications Devices ,[object Object],p. 484 Communications devices that send and receive digital ISDN and DSL signals Usually external devices in which one end connects to a telephone line and the other end connects to a port on the system unit Next

Communications Devices ,[object Object],p. 484 Fig. 9-28 ,[object Object],[object Object],[object Object],Next

Communications Devices ,[object Object],p. 485 Fig. 9-29 ,[object Object],[object Object],Next

Communications Devices ,[object Object],p. 485 Fig. 9-30 ,[object Object],Next

Communications Devices ,[object Object],p. 486 Fig. 9-31 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Routers below Chapter 9

Communications Devices ,[object Object],p. 486 Fig. 9-32 ,[object Object],Next Click to view animation

Home Networks ,[object Object],p. 487 Fig. 9-33 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Home Networks below Chapter 9

Communications Channel ,[object Object],p. 489 ,[object Object],[object Object],[object Object],Next

Communications Channel ,[object Object],p. 489 Fig. 9-34 Step 1. The sending device requests information using either a physical transmission media or a wireless transmission media. Step 2. When the request leaves the ISP, it travels over T1 lines, microwave stations, earth-based stations, and communications satellites until it reaches the Internet backbone. Step 3. The request travels over T3 lines along the Internet backbone. Step 4. The Request travels over T1 lines until it reaches the destination network server. Next

Physical Transmission Media ,[object Object],p. 490 Fig. 9-35 ,[object Object],Next Transfer Rates for Various Types of LANs Using Physical Transmission Media

Physical Transmission Media ,[object Object],p. 490 Fig. 9-36—9-37 ,[object Object],[object Object],Next

Physical Transmission Media ,[object Object],p. 491 Fig. 9-38 ,[object Object],[object Object],[object Object],Next

Wireless Transmission Media ,[object Object],p. 491 Fig. 9-39 ,[object Object],[object Object],Next

Wireless Transmission Media ,[object Object],p. 492 Fig. 9-40 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Cellular Communications below Chapter 9

Wireless Transmission Media ,[object Object],p. 493 Fig. 9-41 ,[object Object],[object Object],Next

Wireless Transmission Media ,[object Object],p. 494 Fig. 9-42 ,[object Object],Next

Summary of Communications and Networks Chapter 9 Complete Communications terminology and applications How to join computers into a network Various communications devices, media, and procedures

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