Discovering Computers Chapter 9 Communications and Networks
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1 Discovering Computers 2009 Chapter 9 Communications and Networks
2 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
3 Communications What are computer communications? Process in which two or more computers or devices transfer data, instructions, and information p Fig. 9-1
4 Communications What is needed for successful communications? Sending device initiates instruction to transmit data, instructions, or information Communications device connects the sending device to the communications channel Communications channel media on which data, instructions, or information travel Communications device connects the communications channel to the receiving device Receiving device accepts transmission of data, instructions, or information p
5 Uses of Computer Communications What are some uses of communications technology? Internet Web Instant Messaging Chat Rooms Newsgroups Blogs Wikis RSS VoIP FTP Web Folders Video Conferencing Fax Machine or Computer Fax/Modem p. 462
6 Uses of Computer Communications Video: Trillian CLICK TO START
7 Uses of Computer Communications What are wireless messaging services? Text messaging allows users to send and receive short text messages on a phone or other mobile device Picture/video messaging allows users to send graphics, pictures, video clips, sound files, and short text messages Wireless instant messaging allows wireless mobile devices to exchange messages Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Video Messaging below Chapter 9 p
8 Uses of Computer Communications What are wireless Internet access points and cybercafés? Wireless Internet access point allows wireless connection to Internet in public location 3G and 4G networks Cybercafé is a coffee house that provides computers with Internet access p Fig. 9-4
9 Uses of Computer Communications What is a global positioning system (GPS)? Step 1. GPS satellites orbit Earth. Every thousandth of a second, each satellite sends a signal that indicates its current position to the GPS receiver. Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click GPS below Chapter 9 Step 2. A GPS receiver (such as in a car, a wearable device, a smart phone, 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. p. 466 Fig. 9-6
10 Uses of Computer Communications What are collaboration and groupware? Collaboration is working with other users connected to a server Web conference Groupware is software that allows people work together and share information Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Web Conferences below Chapter 9 p. 467 Fig. 9-7
11 Uses of Computer Communications What are voice mail and web services? Voice mail is voice message converted to digital form Web services describe standardized software that enables programmers to create applications that communicate with other remote computers over the Internet or on an internal business network p. 468 Fig. 9-8
12 Networks What is a network? Collection of computers and devices connected via communications devices and transmission media p. 469 Fig. 9-9
13 Networks What is a local area network (LAN) and a metropolitan area network (MAN)? A LAN is a network in limited geographical area such as home or office building Wireless LAN (WLAN) Metropolitan area network (MAN) connects LANs in city or town p Fig. 9-10
14 Networks What is a wide area network (WAN)? Network that covers large geographic area using many types of media Internet is world s largest WAN p. 472 Fig. 9-12
15 Networks What is a client/server network? One or more computers act as server and other computers, or clients, access server p. 472 Fig. 9-13
16 Networks What is a peer-to-peer network? Simple network that connects fewer than 10 computers Each computer, or peer, has equal capabilities p. 473 Fig. 9-14
17 Networks What is Internet peer-to-peer (P2P)? Sometimes called a file sharing network Enables users to connect to each other s hard disks and exchange files directly Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click BitTorrent below Chapter 9 p Fig. 9-15
18 Networks What is a bus network? All computers and devices connect to central cable or bus Example of network topology (layout of devices in network) Popular topologies are bus, ring, and star p. 474 Fig. 9-16
19 Networks What is a ring network? Cable forms closed loop (ring), with all computers and devices arranged along ring Data travels from device to device around entire ring, in one direction p. 474 Fig. 9-17
20 Networks What is a star network? All devices connect to a central device (hub or switch) All data transferred from one computer to another passes through hub or switch p. 475 Fig. 9-18
21 Networks What is an intranet? Internal network that uses Internet technologies Makes information accessible to employees Typically includes connection to Internet Extranet allows customers or suppliers to access part of company s intranet p. 475
22 Network Communications Standards What are Ethernet and token ring? Ethernet technology allows computers to contend for access to network If two computers send data at same time, a collision occurs and computers must send again Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Ethernet below Chapter 9 Token ring technology controls access to network by requiring devices to pass a special signal, called token p. 476
23 Network Communications Standards What are TCP/IP and (Wi-Fi)? TCP/IP (Transmission Control Protocol/Internet Protocol) technology transmits data by breaking it up into small pieces, or packets Commonly used for Internet transmissions (Wi-Fi) is a family of standards for wireless LANs p Fig. 9-20
24 Network Communications Standards What is Bluetooth? Short-range radio waves transmit data between Bluetooth devices p. 478
25 Network Communications Standards What are UWB, IrDA, RFID, WiMAX, and Wireless Applications Protocol (WAP)? UWB specification allows data to be transferred wirelessly via short-range radio waves Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click WiMAX below Chapter 9 p IrDA specification allows data to be transferred wirelessly via infrared light waves Radio Frequency Identification (RFID) uses radio signals to communicate with a tag placed in an object Worldwide Interoperability for Microwave Access (WiMAX or ) standard that specifies how wireless devices communicate over the air in a wide area Wireless Applications Protocol (WAP) allow wireless mobile devices to access Internet
26 Communications Software What is communications software? 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 p. 480
27 Communications Over the Telephone Network What is the public switched telephone network (PSTN)? Worldwide telephone system that handles voice-oriented telephone calls p. 481 Fig. 9-23
28 Communications Over the Telephone Network What is a dial-up line? Temporary connection using telephone line for communications Costs no more than making regular call Computers at any two locations can establish a connection using modems and telephone network p. 481
29 Communications Over the Telephone Network What is a dedicated line? Always-on connection between two communications devices Five types are ISDN line, DSL, FTTP, T- carrier line, and ATM Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click FTTH below Chapter 9 p. 482 Fig. 9-24
30 Communications Devices What are examples of communications devices? Common types are dial-up modems, ISDN and DSL modems, cable modems, wireless modems, network cards, wireless access points, routers, and hubs ISDN and DSL modems send and receive data from ISDN and DSL lines p. 484
31 Communications Devices What is a dial-up modem? A dial-up modem converts digital signals to analog signals and vice versa Usually in the form of an adapter card p. 485
32 Communications Devices What are ISDN and DSL modems? 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 p. 485
33 Communications Devices What is a cable modem? Sends and receives data over cable television network Much faster than dial-up modem or ISDN Sometimes called a broadband modem Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Cable Modems below Chapter 9 p Fig. 9-28
34 Communications Devices What is a wireless modem? Allows access to the Web wirelessly from a notebook computer, a smart phone, or other mobile device Typically use the same waves used by cellular telephones p. 486 Fig. 9-29
35 Communications Devices What is a network card? Adapter card, PC Card, ExpressCard module, USB network adapter, or flash card that enables computer or device to access network Sometimes called network interface card (NIC) p Fig. 9-30
36 Communications Devices What is a wireless access point? Central communications device that allows computers and devices to transfer data wirelessly among themselves or wirelessly to a wired network p. 487 Fig. 9-31
37 Communications Devices What is a router? Connects computers and transmits data to correct destination on network Routers forward data on Internet using fastest available path Some routers have a built-in hardware firewall Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Wireless Routers below Chapter 9 p. 488 Fig. 9-32
38 Communications Devices What is a hub or switch? Device that provides central point for cables in network p Fig. 9-33
39 Home Networks What is a home network? Multiple computers connected in home Several types of home networks Ethernet connect computers via cable Powerline cable use electrical lines in house Phoneline use telephone lines Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Home Networks below Chapter 9 p Fig. 9-34
40 Communications Channel What is a communications channel? Transmission media on which data travels in communications system Transmission media are materials or substances capable of carrying one or more signals Bandwidth is amount of data that can travel over a communications channel p. 491
41 Communications Channel How is a request sent over the Internet using a communications channel? p. 491 Fig. 9-35
42 Physical Transmission Media What is physical transmission media? Wire, cable, and other tangible materials used to send communications signals p. 492 Fig. 9-36
43 Physical Transmission Media What are twisted-pair cable and coaxial cable? Twisted-pair cable is used for telephone systems and network cabling Coaxial cable is often used for cable television wiring p. 493 Fig
44 Physical Transmission Media What is fiber-optic cable? Capable of carrying significantly more data at faster speeds than wire cables Less susceptible to interference (noise) and, therefore, more secure Smaller size (thinner and lighter) p. 493 Fig. 9-39
45 Wireless Transmission Media What is wireless transmission media? Used when inconvenient, impractical, or impossible to install cables Includes Bluetooth and IrDA p. 494 Fig. 9-40
46 Wireless Transmission Media What are broadcast radio and cellular radio? Broadcast radio distributes radio signals over long and short distances Cellular radio is form of broadcast radio used for mobile communications Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click 4G Networks below Chapter 9 p. 494 and 495 Fig. 9-41
47 Wireless Transmission Media What is a microwave station? Earth-based reflective dish used for microwave communications Must transmit in straight line with no obstructions p. 496 Fig. 9-42
48 Wireless Transmission Media What is a communications satellite? Space station that receives microwave signals from earth-based station, amplifies signals, and broadcasts signals back to any number of earthbased stations p. 496 Fig. 9-43
49 Summary of Communications and Networks Communications terminology and applications How to join computers into a network Various communications devices, media, and procedures Chapter 9 Complete
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