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 standards 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

[object Object],Communications p. 460 - 461 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. 462 Web Internet E-Mail Instant Messaging Internet Telephony Newsgroups Chat Rooms Web Folders Fax Machine or Computer Fax/Modem Video Conferencing FTP Next

Uses of Computer Communications ,[object Object],p. 463 - 464 Next Wireless instant messaging allows wireless mobile devices to exchange messages Text messaging allows users to send and receive short text messages on a smart phone or PDA Picture messaging allows users to send graphics, pictures, video clips, sound files, and short text messages

Uses of Computer Communications ,[object Object],p. 464 Fig. 9-5 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Hot Spots below Chapter 9

Uses of Computer Communications ,[object Object],p. 466 Fig. 9-6 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

Uses of Computer Communications ,[object Object],p. 467 - 468 Fig. 9-7 ,[object Object],[object Object],[object Object],Next

Uses of Computer Communications ,[object Object],p. 468 Fig. 9-8 ,[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],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Local Area Networks below Chapter 9

Networks ,[object Object],p. 472 Fig. 9-12 ,[object Object],[object Object],Next

Networks ,[object Object],p. 472 Fig. 9-13 ,[object Object],Next

Networks ,[object Object],p. 473 Fig. 9-15 ,[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. 9-16 ,[object Object],[object Object],[object Object],Next

Networks ,[object Object],p. 475 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

Network Communications Standards ,[object Object],p. 476 ,[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

Network Communications Standards ,[object Object],p. 477 - 478 Fig. 9-20 ,[object Object],[object Object],[object Object],Next

Network Communications Standards ,[object Object],p. 478 ,[object Object],Next

Network Communications Standards ,[object Object],p. 478 - 480 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

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Communications Software ,[object Object],p. 480 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 Over the Telephone Network ,[object Object],p. 481 Fig. 9-23 ,[object Object],Next

Communications Over the Telephone Network ,[object Object],p. 481 ,[object Object],[object Object],[object Object],Next

Communications Over the Telephone Network ,[object Object],p. 482 Fig. 9-24 ,[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. 484 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. 485 Figs. 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. 485 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. 485 - 486 Fig. 9-28 ,[object Object],[object Object],[object Object],Next

Communications Devices ,[object Object],p. 486 Fig. 9-29 ,[object Object],[object Object],Next

Communications Devices ,[object Object],p. 486 Fig. 9-30 ,[object Object],[object Object],Next

Communications Devices ,[object Object],p. 487 Fig. 9-31 ,[object Object],Next

Communications Devices ,[object Object],p. 488 Fig. 9-32 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Hardware Firewalls below Chapter 9

Communications Devices ,[object Object],p. 488 Fig. 9-33 ,[object Object],Next

Home Networks ,[object Object],p. 489 Fig. 9-34 ,[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. 491 ,[object Object],[object Object],[object Object],Next

Communications Channel ,[object Object],p. 491 Fig. 9-35 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. 492 Fig. 9-36 ,[object Object],Next

Physical Transmission Media ,[object Object],p. 493 Fig. 9-37—9-38 ,[object Object],[object Object],Next

Physical Transmission Media ,[object Object],p. 493 Fig. 9-39 ,[object Object],[object Object],[object Object],Next

Wireless Transmission Media ,[object Object],p. 494 Fig. 9-40 ,[object Object],[object Object],Next

Wireless Transmission Media ,[object Object],p. 494 Fig. 9-41 ,[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. 495 Fig. 9-42 ,[object Object],[object Object],Next

Wireless Transmission Media ,[object Object],p. 496 Fig. 9-43 ,[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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