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This 143 page Class Notes was uploaded by Kenyatta McDermott on Monday October 12, 2015. The Class Notes belongs to CISM 1120 at Georgia Southern University taught by Joseph Bullington in Fall. Since its upload, it has received 53 views. For similar materials see /class/222070/cism-1120-georgia-southern-university in Computer Information Systems at Georgia Southern University.
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Date Created: 10/12/15
Discovering Computers 2009 Chapter 9 Communications and Networks Chapter 9 Objectives Discuss the components required for successful communications Explain the purpose of communications software Identify various sending and receiving devices Describe various types of lines for commimications over the telephone network Describe uses of computer communications 39 Describe commonly used communications devices List advantages of using a network Discuss different ways to set up a home network Differentiate among clientserver peer topeer and P2P networks Identify various physical and wireless transmission media Describe the various network c39Ommum39cations standards Communications What are computer communications gt Process in which two or more computers or devices transfer data instructions and information L a nu 4L IV mum I r 3 lt A u m if mm 39 W gm m yg ml p 460 461 Fig 9 1 Communlcatlons What is needed for successful communications i x Sending Communications Communications leVice initiates dev1ce connects Channel media instruction to the sending dev1ce to on which data 3 transmitdata the communications instructions or 3 instructions or channel information travel information Communications Receiving device connects device accepts the communications transmission of data channel to the instructions or receiving device information p 460 461 Uses of Computer Communications What are some uses of communications technology I aV Machine or Computer P aX Modem Vi dco Conferencing p462 Uses of Computer Communications Video Trillian CLICK TO START Uses of Computer Communications What are wireless messaging services Text messaging allows users to send and receive short Wireless instant messaging allows wireless mobile devices to exchange text messages on a phone or other Picturevideo messages moblle dev1ce messaging allows 39 users to send graphics pictures Click Video ClipS sound Elig i nfri f ick les and short text Video Messaging below Chapter 9 p 463 464 messages Uses of Computer Communications What are wireless Internet access points and cybercaf s gt Wireless Internet access point allows wireless connection to Internet in public location I 3G and 4G networks gt Cybercaf is a coffee house that provides computers with Internet access p 464 465 Fig 94 Uses of Computer Communications What is a global positioning system GPS Step 1 GPS satellites orbit Step 2 Earth Every A GPS receiver thousandth of a such as in a car second each satellite a wearable sends a signal that device a smart indicates its current phone a position to the GPS handheld device receiver or a collar determines its location on Earth by analyzing at least 3 separate satellite signals from the 24 Click to View Web A W A v v t r 394 satdhtes 1 orb Link click Chapter 9 Click Web Link from e navigation then click GPS below Chapter 9 p 466 Fig 96 Uses of Computer Communications What are collaboration and groupware gt Collaboration is working with other users connected to a server I Web conference gt Groupware is software that allows people work together and share I information Click to View Web Link click Chapter 9 Click Web Link from Ie navigation then click eb Conferences below Chapter 9 p 467 Fig 97 Uses of Computer Communications What are voice mail and web services gt Voice mail is voice message converted to digital form gt 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 98 Networks What is a network gt Collection of ea quot s quot 9 computers and devices connected Via communications devices and transmission media p 469 Fig 99 Networks What is a local area network LAN and 39a metropolitan area network MAN gt ALAN is a network in limited geographical area such as home or of ce building I Wireless LAN WLAN gt Metropolitan area network MAN connects LANs in city or town p471 472 Fig910 Networks cellular communications 3 connection satelllte What is a Wide area network WAN gt Network that c0vers large geographic area using many types of media gt Internet is world s largest WAN lelecommutlng employee employee inlelnalional of ce p 472 Fig 912 Networks What is a clientserver network gt One or more computers act as server and other computers or clients access server p 472 Fig 9 13 printer Networks What is a peertopeer network gt Simple network that connects fewer than 10 computers gt Each computer or peer has equal capabilities p473 Fig 9 14 printer may be used by all computers on network network operating system and application software installed on each computer Networks What is Internet peertopeer P2P gt Sometimes called a le sharing network 352741 e isr rsi39t gt Enables users to tame3 3 connect to each other s hard disks and exchange les directly Click to View Web Link click Chapter 9 Click Web Link from Ie navigation then click BitTorrent below Chapter 9 p 473 474 Fig 915 Networks What is a bus network gt All computers and devices connect to central cable or bus gt Example of network topology layout of devices in network 39 Popular topologies are bus ring and star 5333 L717 4 computer L E f j 1 a quot A 5 personal compulcr personal computer DBTSUIIHI Gum Ul el p 474 Fig 916 Networks What is a ring network gt Cable forms closed loop ring with all computers and devices arranged along ring gt Data travels from device to device around entire ring in one direction p 474 Fig 917 Networks What is a star network gt All devices connect to a central device hub or switch gt All data transferred from one computer to another passes through hub or switch p 475 Fig 918 E gt file server printer personal comPl ier 1E394 E A F personal comPUter 11 A T svil b Networks What is an intranet I network at ln emel temnoloxgllee Makes information accessible to employees I ljplmllllg Mallowas permeation lllhllii lrl m Extranet allows customers or suppliers to access part of company s intranet p475 Network Communications Standards What are Ethernet and token ring Click to View Web Link click Chapter 9 Click Web Link from Ie navigation then click Ethernet below Chapter 9 p476 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 Token ring technology controls access to network by requiring devices to pass a special signal called token Network Communications Standards What are TCPIP and 80211 WiFi gt TCPIP Transmission Control ProtocolInternet Protocol technology transmits data by breaking it up into small pieces or packets I Commonly used for Internet transmissions gt 80211 WiFi is a family of standards for wireless LANS 802 1 SERIES OF STANDARDS Standard TransferRa1eS 80211 1 or 2 Mbps 1 802113 Upto 54 Mbps 80211b Upto 11 Mbps 1 80211g 54 Mbps and higher 80211n 108 Mbps and higher p 477 478 Fig 9 20 Network Communications Standards What is Bluetooth Shortrange radio waves transmit data between Bluetooth devices p478 Network Communications Standards What are 5397 9 lquotrquott 1531 39 Vil 5 I and r 1 U WB specification allows data to be transferred wirelessly via shortrange radio waves or 3021 6 standard that specifies how wireless devices communicate over the air Radio Frequency in a Wide area Identification RFID Y quot relVase 19 plien ona Protraan WA allow wireless mobile devices 139quot Click to View Web Link click Chapter 9 Click Web Link from le navigation then click WiMAX below Chapter 9 p 478 480 to access Internet Communications Software What is communications software p480 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 What is the public switched telephone network PSTN gt Worldwide telephone satelme I 39 local EEQW teeuhone a y cmnww w I 1 quot V39se 39 3 system that handles WW 1 g voiceoriented 4 A telephone calls telephone sevvlce 39 customer p 481 Fig 9 23 Communications Over the Telephone Network What is a dialup line gt Temporary connection using telephone line f0r communications 39 Costs no more than making regular call 39 Computers at any two locations can establish a connection using modems and telephone network p481 Communications Over the Telephone Network What is a dedicated line gt Always0n conneCtion SPEEDS nF VARIOUS INTERNET calm 39 between two communications devices I Five types are ISDN 1ineDSL FTTP T carrier line and ATM Click to View Web Link click Chapter 9 Click Web Link from Ie navigation then click FI39TH below Chapter 9 p 482 Fig 9 24 Ecriiiiis 1 4 4 Dialup Local or longdistance iales Up to 56 Kbps ISDN 10to 40 Upt01 54 Mbps DSL 13 to 70 128 Kbps to 8 45 Mbps Cabte TV CATV 20 to 50 128 Kbps to 52 Mbps FWP 35 to 180 5 Mbps to IOU Mbps Fixed ereless 351080 256 Kbps to 10 Mbps Fractional T1 200 to 700 128 Kbps to 768 Kbps T1 400 to 1600 1544 Mbps T3 500010 15000 44 736 Mbps ATM 3000 or more 155 Mbps to 622 Mbps can reach 10 Gbps Communications Devices n lt What are examples of 11111332quot g mtm m gm fmlswlfog mm iccmm Edam mm immigalmg Ec bllk g rumbjw Wham mkmw mmm k mm mmw whim Emmm 6161 Emma j KEEN mdiEgEmmam mil mm dme rmm ESL p484 Communications Devices What is a dialup modem gt A dialup modem converts digital signals to analog signals and vice versa gt Usually in the form of an adapter card p 485 Communications Devices What are ISDN and i LI v i 1 Communications devices that send and receive digital ISDN and DSL signals gt A W v 1 m o 3Q Mammy 311 when one fin 1lean and an x email gsnnmat s 11 waif ut it p485 Communications Devices What is a cable modem gt Sends and receives data over cable television network gt Much faster than dialup modem or ISBN gt Sometimes called a broadband modem Click to View Web Link click Chapter 9 Click Web Link from Ie navigation then click able Modems below Chapter 9 p 484 486 Fig 928 Communications Devices What is a wireless modem gt Allows access to the Web wirelessly from a notebook computer a smart phone or other mobile device gt Typically use the same waves used by cellular telephones anienna on wireless PC Card modem communicates with wireless Internet access provider wireless Pc Card modem inseried in PC slat an naiebnok campuier p 486 Fig 9 29 Communications Devices What is a network card gt Adapter card PC 39 Card ExpressCard module USB network adapter or ash card that enables computer or device to access network gt Sometimes called network interface card NIC p 486 487 Fig 9 30 Communications Devices What is a wireless access point gt 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 Communications Devices What is a router gt Connects computers and transmits data to correct destination on network gt Routers forward data on Internet using fastest available path gt Some routers have a builtin 39 hardware rewall Click to View Web Link click Chapter 9 Click Web Link from Ie navigation then click Wireless Routers below Chapter 9 p 488 Fig 9 32 p w 3 Communications Devices What is a hub or switch gt Device that provides central point for cables in network lg mm or s It h hub nr switch E1 g 15 mg p 488 489 Fig 9 33 Home Networks What is a home network gt Multiple computers connected in home gt Several types of home SI 1 Usinegpazc m omsci networks cmmmm ems pm Step 1 m u u man52m tmeim mm mm aslhwgha ztle y DEL 39caem I Ethernet connect 3 computers Via cable Powerline cable use electrical lines in house Phoneline use 39 telephone lines Click to View Web Link click Chapter 9 Click Web Link from le navigation then click Home Networks below Chapter 9 p 489 490 Fig 934 Step 4 metal a mm mm m a mum acaptei m omer desktop cranes n lhemmenelw k Communications Channel What is a communications channel gt Transmission media on which data travels in communications system media mmmmwa m g J h us anaMQwJLOJLI M Bandwidl 1 H quot quot p491 Communications Channel How is a request sent over the Internet using a communications channel p 491 Fig 935 Physical Transmission Media What is physical transmission media TRANSFER mes FDR VAmuus mass gt Wire cable or LANS usma PHYSICAL TRANSMISSION and other tangible Typemm Maxim materials used a n tLAN Transier nale to send TwistedPair Cable 1DBase T Ethernet 10 Mbps communications 1DOBaseT Fast Ethernet 100 Mbps 1DOOBaseT 1 Gh 5 Slgnals Gigabit Ethernet p 39 Token ring 4 Mbps to 16 Mbps Coaxial Cable 1DBase2 10 Mbps ThinWire Ethernet c1DBase5 10 Mbps ThickWire Ethernet FiberOptic Cable 1DBaseF Ethernet 10 Mbps tooBaseFX 100 Mbps Fast Ethernet FDDl Fiber Distributed 100 Mbps Data Interface token ring Gigabit Ethernet 1 Gbps 1DGigabit Ethernet 10 Gbps p 492 Fig 936 Physical Transmission Media What are twistedpair cable and coaxial cable gt Twistedpair cable is used for telephone systems and network cabling iwisiadA 39 5 s nmiwire r twisicd39vmv cable 39 Q 395 I we gt Coaxial cable is often used for cable television Wining g N insulating p astic outer coating 236 material we m m p493 Fig 937 938 Physical Transmission Media What is beroptic cable gt Capable of carrying cute 1 cable contains significantly more m REP data at faster speeds than wire cables eptical gt Less susceptible mm to interference V noise and therefore faxing 7 quot more secure 7 7 gt Smaller size thinner ggzi ive 39Pii g So i ihllghbgtween and lighter p493 Fig 9 39 Wireless Transmission Media What is wireless transmission media gt Used when inconvenient impractical or impossible to install cables gt Includes Bluetooth and IrDA TRANSFER HATES FOR VARIOUS TYPES OF WIRELESS TRANSMISSION MEDIA Infrared 115 to 4 Brnadcasl radio Bluetooth 1 Mbps to 2 Mbps HomeRF 16 Mbps lo 10 Mbps 802 11b 5 802119 54 Mbps 8021 11 54 UWB 110 to 480 Cellular radio 26 96 ths to 192 th5 36 144 Kbps to 24 Mbps 4G 15 Micrnwave radio Communications satellite 150 1 p 494 Fig 9 40 Wireless Transmission Media What are broadcast radio and cellular radio gt Broadcast radio distributes radio signals over long and short distances gt Cellular radio is form of broadcast radio 39 used for mobile communications Click to View Web Link click Chapter 9 Click Web Link from Ie navigation then click 4G Networks below Chapter 9 public swiluhed Ielqmmie network H m p 494 and 495 Fig 9 41 Wireless Transmission Media What is a microwave station gt Earthbased re ective dish used for microwave communications gt Must transmit in straight line with no obstructions microwave stations p 495 Fig 9 42 Wireless Transmission Media What is a communications satellite gt Space station imcummunicio salsllita that receives microwave signals from earthbased station amplifies signals and broadcasts signals back to any number of earth based stations earlhbased slaliun p 496 Fig 9 43 Discovering Computers 2009 Chapter 7 Storage Chapter 7 Objectives mmig m I o hn and J Storage What is storage gt Holds data instructions and information for future use gt Storage medium is physical material used for stogliagei I Also called secondary storage p 354 355 Fig 7 1 Storage What is capacity gt Number of bytes characters a storage medium can hold p356 Kilobyte KB 1 thousand Megabyte MB 1 million Gigabyte GB 1biion Terabyte TB Petabyte PB Exabyte EB Zettabyte ZB Yottabyte YB 1 septillion 1 trillion W 1 quadrillion 1 quintillion 1 sextillion Storage How does volatility compare gt Storage medium is nonvolatile contents retained when power is off gt Memory is volatile holds data and instructions temporarily ON C x a 2 E dew 393 o gt Mmme mi s ammng 2 U l l b 5 user g Storage Medium Contents Contents 5 hard disks CDs DVDs available to retained 2 USB ash drives etc user p355 Storage What is a storage device i r Hardware that records and J 4 retrieves items quot x to and from 39 T quot 39 39 storage media Functions as source of input Creates output p356 Storage What is access time gt Time it takes storage device to locate item on storage medium gt Time required to deliver item from memory to processor faster Transfer rates t S 5 Software user data and Digital pictures or files to be transported Flash Memory Cards and USB Flash Drives CDs and DVDs Software backups movies music slower transfer Tape Backups rates p357 Fig 7 4 Magnetic Disks What are tracks and sectors Track sectors sector is narrow recording band StOI eS up to that forms full 512 bytes of data circle on disk 39 4 Formatting prepares disk for use p357 Fig 7 5 Magnetic Disks What is a hard disk gt Highcapacity storage gt Consists of several in exible circular platters that store items electronically gt Components enclosed in airtight sealed case for protection Click to View Web Link click Chapter 7 Click Web Link from Ie navigation then click Perpendicular Recording below Chapter 7 p 358 Fig 76 Magnetic Disks E Lna15iCFmperties 7 Sequiylyi 7L Frievlnusjfelsmnsri L Eye Genela1 1 Tools Hardware Sharing Type Loca1Disk F115 system NTF S I Used space 397554111515 bye 3815 GB FIEB space 11230518411480 bytes 111 4GB 1 8 pe 39 l ld 512 Capacity 485970052885 bytes 493158 Sectors per track 68 Sectors per drive 978773168 Revolutions per minute 7200 g I Transfer rate 300 MBps i quot L Compress this dlwe m save disk space Access tlm e 8395 ms 1E1ndexMsdrivelorrastersearchirg Cancel p 359 Fig 77 Magnetic Disks How does a hard disk work 9 The circwi board contro s me mmemem orquot the head actuator and a smaH molar p 2 A sma molar spins 1he p a ers whire The ccmpmer 5 running Step 3 When soflware requests a disk access the readwrite heads delermhwe the currem or new Ionatron of tha data p 4 The head amuator posiirons Iha readwrrle head arms over the curred ocahon on the planers 10 read or wrha datar p 360 Fig 78 Magnetic Disks What is a cylinder gt Vertical section of track through all platters gt Single movement of readwrite head arms accesses all platters in cylinder p 360 Fig 79 cylinder Magnetic Disks What is a head crash gt Occurs when readwrite head touches platter surface gt Spinning creates cushion of air that oats readmite head above platter Qmii l ljibnthsaqf an inch I Clearance between head and platter is approximately I A smoke particle dust particle or human hair coulff tender driMBT unusable readwrite head clearance p 360361 Fig 7 10 Magnetic Disks What is a disk cache gt Portion of memory that processor uses 3M1 3 t t rans ers e f0 s ore I requested llem Step 2 4 lo me processor II the oonlrol er requen a 11 does nutflnd the acces se 1 ems quested 9 39 disk cams rt luLdLes Step the requested He 1 AspecIaIpurpose M on Iha haul disk s chip on the hard disk platters caHed a conlmller receives a request for data instructions or informa ion ham the rocessur L The uunlrorrar Trrsl checks disk cache fur the requasted item p 361 Fig 7 11 Magnetic Disks What is RAID gt Redundant Array of Independent Disks gt Connects multiple smaller disks into a single unit that acts as a single large hard disk Click to View Web Link click Chapter 7 Click Web Link from Ie navigation then click RAID below Chapter 7 p 362 Magnetic Disks What is a miniature hard disk gt Provide greater storage capacities than flash memory gt Smaller than notebook computer hard disks gt A pocket hard drive is a selfcontained unit 7 w r t Click to View Web Link click Chapter 7 Click Web Link from Ie navigation then click Pocket Hard Drives below Chapter 7 p 362 Fig 7 13 Magnetic Disks What are external hard disks and removable hard disks gt Used to back up or transfer files Removable hard disk hard Idisk External hard disk freestanding that you insert land remove hard disk that connects to system unit from hard diSk drive one type a vemowble hard disk p 363 Fig 7 14 Magnetic Disks What is a disk controller gt Chipirnd circuits thatcontrol transfer of items from disk g mgg EIDE Enhanced Integrated Drive rm quotmm 11 Electronics controller supports four 112 hard disks provides connections for Minuteman n mmmr ium CD and DVD d ves SCSI controller supports up to fifteen I devices including hard disks CD WV Lg VJ and DVD drives tape drives r m quot gigk39eghgftgr printers scanners network cards a 9m 315mm 7 Click Web Link 3 from Ie navigation K quot lt4 then click below Chapter 7 p363364 Magnetic Disks What is online storage gt Service on Web that provides storage for minimal monthly fee Files can be accessed from any computer With Web access Large files can be downloaded instantaneously Others can be authorized to access your data p 364 365 Fig 7 15 using Karma Protect your Pho 05 Music Videos and Files wumsca mm secure online muse I ampl SGB Heel Magnetic Disks What is a oppy disk gt Portable inexpensive storage medium also called diskette Thin circular exible lm enclosed in 35 Wide plastic shell p 365 Fig 716 Optical Discs What are optical discs gt Flat round portable metal discs made of metal plastic and lacquer gt Can be read only or readwrite gt Most PCs include an optical disc drive p 366 Fig 7 17 Push button to slide out tray Insert disc Push same button K to close tray 7 Optical Discs How does a laser read data on an optical disc L 39 m lenm pit p 367 Fig 718 Optical Discs How is data stored on an optical disc gt Typically stored in discsectori single track gt Track divided into evenly sized sectors that store items p 367 Fig 7 19 Optical Discs How should you care for an optical disc DO san he Ilisc in a iewal hnx when no in use I DIJ hold a disc hv ils ydgas 7 ul 39i39mdju discs s p 368 Fig 720 Optical Discs What is a CDROM gt Compact disc readonly memory gt Cannot erase or modify contents gt Typically holds 650 MB to 1 GB gt Commonly used to distribute multimedia and complex software Click to View Web Link click Chapter 7 Click Web Link from Ie navigation then click CDROMs below Chapter 7 p 369 Fig 722 Optical Discs What is the data transfer rate of a CDROM drive Ranges from 48X to 75X or faster 75 x 150 KBps 11250 KBps 75X 1s 10 KBPS 01 1225 MBps KB per second 48 x 150 KBps 7200 KBps or 72 MBps p369 Optical Discs What are CDRs and CDRWs aw ompact isc ecordable disc you can write on once 39ompact isc e ritable erasable disc you can write on quot7wa multiple times Click to View Web Link click Chapter 7 Click Web Link from Ie navigation then click CDRs and CDRWs below Chapter 7 p 370 Miami D murder an SDR drive Cannot erase disc s contents mi Wmm SDKW arm Optical Discs What is an Archive CD Step 1 unmi w w riigimi it cos 0 mung wmmun 1y brothers to View Step 3 PM Hi YUUr MENVE CD a a desianaisd store or receive it n e 1 3 Name CD aia Mos Click to View Web Link click Chapter 7 Click Web Link from Ie navigation then click Archive CDs below Chapter 7 p370 371 Fig 7 23 Optical Discs Got Your Video Right Here CLICK TO START Optical Discs What is a DVDROM digital versatile discROM or digital Video discROM gt gt p 372 Fig 724 Must have DVDROM drive or DVD player to read DVDROM Stores databases music complex software and movies Bluray discs have storage capacity of up to 100 GB HDDVD discs have storage capacity of up to 60 GB HDVMDs have storage capacity of up to 40 GB or more UNID can store up to 18 GB Optical Discs How does a DVDROM store data gt Two layers of pits are used lower layer is semitransparent so laser can read through gt Some are doublesided gt Many types of recordable and rewritable DVDs are available gt DVDR and DVDR gt DVDRW DVDRW and DVDRAM DVD DD AND HD DVD STORAGE CAPACITIES Sides Layers DVDROM BDHOM HD DVDROM 1 1 47 GB 25 GB 15 GB 2 85 GB 50 GB 30 GB i 94 GB 50 GB 30 GB 2 Click to View Web Link click Chapter 7 Click Web Link 17 GB 100 GB 50 GB from Ie navigation then click BIu ray and HD DVD below Chapter 7 p372 373 Fig 7 25 NNA Tape What is tape gt Magnetically coated plastic ribbon capable of storing large amounts of data at low c0st gt Primarily used for backup p374 Fig 7 27 Tape How is data stored on a tape gt Sequential access I Reads and writes data consecutively like music tape I Unlike direct access used on hard disks CD31 and DVDs which can locate particular item immediately p374 PC Cards and ExpressCard Modules What are PC Cards and ExpressCard Modules gt Adds capabilities to computer gt Creditcardsized device commonly used in notebook computers p 374 Figs 728 Miniature Mobile Storage Media What is miniature mobile storage media gt Storage for small mobile devices p375 Fig 7 29 Miniature Mobile Storage Media minrnSD Memory Stick sow iv PRU DIID MlJHHISHMFHDUM miniSD dime a Click to View Web Link click Chapter 7 Click Web Link from e navigation then click microSD Cards below Chapter 7 p 376 Fig 7 30 Miniature Mobile Storage Media p377 Fig 7 31 Whm you msm a mermrycam in a can readerw card siul the memory Lam s 11539 a nun um make comm wiih cunnccior in ihc can roamWily or card sM aHuwmg me transier u pmlJves mi an ev nevus hammn 1h card and he ma ng vm mng dcu ac u lam m nctch or We SHE cards remain Mite comm oi the nemoi y card wqu W Max amp preuew me 935mm which prevent users awde ally shppmg mm aw 39Hiali L oui Hhe Cad I l erasing pictures and readermm m L Card SD ash mm c m We mm as am mm iyprs af data and Hfomation Wher rquasIed the comro eri39ansfers News a 39Jwe I ash meme 3939 ohms in the neiailic conduclms using reg sters for tarraorary wage as needed 5 rk Miniature Mobile Storage Media What is a USB Flash Drive gt Plugs in a USB port on a computer or mobile device gt Storage capacities up to 64 GB gt May eventually make the floppy disk nearly obsolete Click to View Web Link click Chapter 7 Click Web Link from Ie navigation then click U lash rives below Chapter 7 p377 Fig 7 32 Miniature Mobile Storage Media What is a smart card gt Stores data on microprocessor embedded in small card gt Input process output and storage capabilities i i I i i i l I l I Click to View Web Link click Chapter 7 Click Web Link from Ie navigation then click Cards below Chapter 7 p 378 Fig 733 Microfilm and Microfiche What are micro lm and micro che Store microscopic images of documents on roll or sheet of film m 39 3mm Tili jg 1313 Wigwam1 Microfilm 100 to 215f00t roll of lm Microfiche small sheet of film usually 4 x 6 p 379 Fig 734 Microfilm and Microfiche How 10 life expectancies of various media compare gt Micro lm and micro che have longest life of any storage media MEDIA LIFE EXPECTANCIES when using highquality media Media Type Guaranteed Life Expectancy Potential Life Expectancy Magnetic disks 3 to 5 years 20 to 30 years Optical discs 5 to 10 years 50 to 100 years Microfilm 100 years 500 years according to manufacturers of the media p379 Fig 7 35 Putting It All Together What are recommended storage devices fOr home users 320 GB hard disk Online storage CD or DVD drive Card readerwriter USB flash drive i p 380 Fig 7 37 Putting It All Together What are recommended storage devices fOr small of cehome of ce SOHO users 1 TB hard disk Online storage CD or DVD drive External hard drive for backup USB flash drive p 380 Fig 737 Putting It All Together What are recommended storage devices fOr mobile users 250 GB hard disk Online storage CD or DVD drive Card readerwriter Portable hard disk for backup USB flash drive p 380 Fig 737 Putting It All Together What are recommended storage devices fOr power users 25 TB hard disk Online storage CD or DVD drive Portable hard diskfor backup USB flash drive p 380 Fig 737 Putting It All Together What are recommended storage devices fOr large business users Desktop computer 1 TB hard disk CD or DVD drive Smart card reader Tape drive USB flash drive Server or Mainframe INetwork storage server 3940 TB hard diskxsystem CD or DVD server IMicrofilm or microfiche p 380 Fig 7 37 Discovering Computers 2009 Chapter 5 Input Chapter 5 Objectives De ne mp1 EXplain how a digital camera works List the characteristics of a keyboard I Describe uses 0f Web cams and video conferencing Describe different mouse types 39 Discuss various scanners and reading and how they work V devices and how they work Summarize how various pointing devices and controllers for gaming and EXPlam the types 0f termlnals media players work 39 Summarize the various biometric Explain how voice recognition works dewces Identify alternative input devices for Describe various input devices physically challenged users for smart phones PDAs and Tablet PCs 39 What Is Input What is input gt Data or instructions entered into memory of computer gt Input device is any hardware component that allows users to enter data and instructions p 234 236 Fig 5 1 What Is Input What are the two types of input gt Data 39 Unprocessed text numbers images audio and Video gt Instructions I Programs I Commands 39 User responses p234 The Keyboard How is the keyboard divided gt Typing area gt Numeric keypad I msdfacnmmis 7 gt Function keys 3395 39 special keys that issue commands cm key A key I W cm key wrisl yes APmc39mnH key p 236 Fig 52 arvow keys The Keyboard What is the insertion point gt Blinking vertical bar that indicates Where the next character you type will be displayed 39 Has 0 mm p Mmr E Aaabtcl39k AsEqu Imam AK A J u Hmmu Wham n mL m u w IRPLANE RIDES Gain an entirely new Vision of Campton by taking an aerial tour Visitor or local business or pleasure the trip p237 Fig 5 3 The Keyboard How are keyboards attached gt Desktop computer keyboards often attach Via a cable gt Wireless keyboards communicate with a receiver attached to a port on the system unit gt Keyboards often are built into mobile devices p 238 Fig 54 Pointing Devices What is a mouse gt Pointing device that ts under palm of hand I Pointing device controls movement of pointer Mechanical mouse Optical mouse Laser mouse Air mouse Wireless mouse 77777 Click to View Web Link click Chapter 5 Click Web Link from le navigation then click Air Mouse below Chapter 5 p 239 Fig 55 and 56 Pointing Devices What are common mouse operations p240 Fig 5 7 Other Pointing Devices What is a trackball gt Stationary pointing device with a ball on its top or side gt To move pointer rotate ball with thumb ngers or palm of hand Click to View Web Link click Chapter 5 Click Web Link from le navigation then click Repetitive Strain Injuries below Chapter 5 p 241 Fig 58 Other Pointing Devices What are a touchpad and a pointing stick gt Touchpad is small at rectangular pointing device sensitive to pressure and motion gt Pointing stick is pointing device shaped like pencil eraser positioned between keys on keyboard p 241 242 Figs 59 5 10 Other Pointing Devices What is a light pen gt Handheld input device that can detect light I Press light pen against screen surface and then press button on pen p 242 Other Pointing Devices What is a 1711 i ai gt Touch areas of screen with nger gt Often used with kiosks gt Microsoft Surface is a 30 inch tabletop display that allows one or more people to interact with the screen using their ngers or hands I Click to View Web Link click Chapter 5 Click Web Link from Ie navigation then click Microso Surface below Chapter 5 p 242 Fig 5 12 and 5 13 Keyboard and Pointing Devices What is a digital pen gt Looks like a ballpoint pen but uses pressure to write text and draw lines gt Used with graphics tablets at electronic boards Click to View Web Link click Chapter 5 Click Web Link from Ie navigation then click Graphics Tablets below Chapter 5 p243 Fig 5 14 Controllers for Gaming and Media Players What are the types of game controllers gt gt V Gamepads Joysticks and Wheels Light gun Dance pad Motionsensing game controller Click to View Web Link click Chapter 5 Click Web Link from Ie navigation then click Wii Remote below Chapter 5 p 244 245 Fig 515 of G Q A motionsensing 39 1quot game cuntmlter Controllers for Gaming and Media Players What is a touchsensitive pad gt Input device on a portable media player that enables users to scroll through and play music view pictures watch videos or movies adjust volume and customize settings gt Click Wheel p 245 Fig 516 Voice Input What is voice input gt The process of entering input by speaking into a microphone gt Voice recognition is the computer s capability of distinguishing spoken words 7 S Click to View Web Link click Chapter 5 Click Web Link from Ie navigation then click Voice Input below Chapter p 245 246 Fig 5 17 Voice Input What is a MIDI musical instrument digital interface gt External device such as electronic piano keyboard to input music and sound effects p 246 Fig 518 Input for Smart Phones PDAs and Tablet PCs How is data entered into a smart phone gt Talk directly into the microphone or by using digital cameras and touchsensitive pads p 247 Fig 5 19 Input for Smart Phones PDAs and Tablet PCs What is a portable keyboard gt A portable keyboard is a fullsized keyboard that communicates with the phone p 24839 Fig 5 20 Input for Smart Phones PDAs and Tablet PCs What is a smart phone gt Users can input and send text messages graphics pictures Video clips and sound les gt Many have a builtin 0r attachable camera A quot 15 39 392 xi T c p 248 249 Fig 5 21 Input for Smart Phones PDAs and Tablet PCs What is a Tablet PC gt Mobile computer that includes handwriting recognition software gt Primary input device is a pressuresensitive digital pen p 249 250 Fig 5 23 Digital Cameras What is a digital camera gt Allows you to take digital pictures gt Images Viewable immediately on camera I Download to computer I Post pictures to Web p 250 251 Fig 5 24 Digital Cameras How does a digital camera work Step 1 7 Step 3 Painllameima e Theima a is ocusedun acmpcaueda Thech enerates an mama to photograph and ake oh g aryecmrpled device CED signa that represems me magev me plcture Ligm passes mto me Iens at the camera ten 4 eanalo slgnal sconv led to dxgilal signa by an ana Dglo DC p 251 Fig 5 25 Digital Cameras What is resolution gt Sharpness and clarity of image gt The higher the resolution the better the image quality but the more expensive the camera gt Pixel picture element is single point in electronic image 39 Greater the number of pixels the better the image quality p 252 Fig 526 Video Input What is video input gt Process of entering fullmotion images into computer gt Video capture card is adapter card that converts analog Video signal into digital signal that computer can use gt Digital Video DV camera records Video as digital signals men camera p253 Fig 5 27 Video Input What is a Web cam gt Web cam is used to capture Video and still images send email messages with Video attachments add live images to instant messages broadcast live images over the Internet and to make Video telephone calls on Internet Click to View Web Link click Chapter 5 Click Web Link from Ie navigation then click Web Cams below Chapter 5 p253 254 Fig 528 Video Input What is video conferencing gt Two or more geographically separated people who use network or Internet to transmit audio and Video data I Whiteboard is another window on screen that can display notes and drawings simultaneously on all participants screens p 254 Fig 5 29 Video Input Video Video Editing on Your Computer CLICK TO START Scanners and Reading Devices Flatbed What is a scanner gt Lightsensing device that reads printed text and graphics 39 Used for image processing converting paper documents into electronic images p 255 256 Fig 5 30 Scanners and Reading Devices How does a atbed scanner work p 255 Fig 5 31 Place the document to be scanned lace d vn on the glass wlnd Usmg buttons on the scanner or the program start process 29 scanner the scannan Step 2 he scanner converts he document content to digital lnlurmatl n which is transmitted through the cable to ma memory at the computer we computer users Step 3 can display the lmage prth it email ll rncluue n m a document or place it on a Wet page Scanners and Reading Devices What is an optical reader gt Device that uses light source to read characters marks and codes and then converts them into digital data 39 Optical character recognition OCR reads characters in OCR font AEB CFD39EFGHIJKLM I Optical mark recognition NopaRgTuvmxyz OMR reads handdrawn pencil 1133 q SE 7 5 cm marks such as small circles 3939391 p 257 Fig 5 32 Scanners and Reading Devices What is a turnaround document mmquot gt Document that you return to the company that sent it 7 m 39 Portion you return has is rem med with payment OCHASE cu ulmumhuhrwAylolrquot Im1uIIMMIHI information printed in OCR characters IHIKPASS MIIEAEE suuMAnv l um Imud no Slllumcvn rum era Enlnud lmcn Mun I NIH mm p 257 Fig 5 33 Scanners and Reading Devices What is a bar code reader gt Uses laser beams to read bar codes M A I Click to View Web Link click Chapter 5 Click Web Link from Ie navigation then click BarCode Readers below Chapter 5 p 258 Fig 5 35 Scanners and Reading Devices What is a bar code gt Identi cation code that consists of a set of vertical lines and spaces of different widths if gt POSTNET gt Universal Product Code UPC p 258 Fig 5 35 Other Input Devices What is an i LEI ix 5 gt Reads information on the tag Via radio waves 39 Can be handheld devices or mounted in a stationary object p 259 Fig 536 RFID tag embedded in label attached to garment 3 o Aquot Other Input Devices What is a magnetic stripe card reader gt Reads the magnetic stripe 0n the back of a credit card gt Exposure to a magnetic eld can erase the contents of a card s magnetic stripe p 260 Fig 5 37 Scanners and Reading Devices What is a magneticink character recognition MICR reader gt Can read text printed with magnetized in k gt Banking industry almost exclusively uses MICR for check processing M F VETAR 75759 2 3 1 3 E VETAR mo ik ll m mm m mM gm A thnf I7 M m a SI NRHPLE fl L I 5 HI EDDDUESI lu L700 2 E 3 1 EL H I39D E3 H u39DCIDDU LLSDDII39 l Ll check amuunl bank muting umber account number Check number p 260 Fig 538 Scanners and Reading Devices What is a data collection device gt Obtains data directly at location where transaction or event takes place gt Transmits data over network or Internet p 261 Fig 5 39 Terminals What is a point of sale POS terminal gt Records purchases processes credit or debit cards and a 7 graphm39uerm 0 updates inventory H 39 Swipe credit or debit card through card reader or use your ngerprint 39 Reads customer s personal data from magnetic strip p 261 262 Fig 5 40 Terminals What is an automated teller machine ATM gt Selfservice banking BANK A ORN39 machine that connects to a CALIF host computer through a network magsmpe gt V eader p 262 Fig 5 41 Biometric Input What is biometrics gt Authenticates person s identity 1 by verifying personal characteristic I Fingerprint reader captures curves and indentations of ngerprint I Hand geometry system measures shape and size of person s hand Click to View Web Link click Chapter 5 Click Web Link from Ie navigation then click Biometric Input below Chapter 5 p 262 264 Fig 542 and 543 Biometric Input What are examples of biometric technology gt Voice veri cation system compares live speech with stored voice pattern gt Signature veri cation system recognizes 39 quot lg shape of signature quot 39i gt Iris recognition system reads patterns in blood vessels in back of retina I Biometric data is sometimes stored on smart card which stores personal data on microprocessor embedded in card p 263 264 Figs 544 5 45 Putting It All Together What are recommended input devices fOr home users p 265 Fig 546 Enhanced keyboard or ergonomic keyboard Mouse Stylus for smart phone or other personal mobile device Game controllers 30bit 600 X 1200 ppi color seanrfer 4me gapier digital camera Headphones that include a microphOne headset Web cam Fingerprint reader Putting It All Together What are recommended input devices for small of cehome of ce users SOHO I Enhanced keyboard or ergonOmic keyboard I Mouse I Stylus and portable keyboardfor smart phone or other personal mobile device or digital p39en39for Tablet PC I 36bit 600 X 1200 ppi color scanner I 5me gapier digital camera I Headphones that include a microphone headset I Web cam p 265 Fig 546 Putting It All Together What are recommended input devices for mobile users I Wireless mouse for notebook computer I Touchpad or pointing stick on notebook computer I Stylus and portable keyboard for smart phone or other personal mobile device or digital pen for Tablet PC I 4 or 5megapixe1 digital camera I Headphones that include a miCrOphone headset I Fingerprint reader for notebook computer p 265 Fig 546 Putting It All Together What are recommended input devices fOr power users I Enhanced keyboard or ergonomic keyboard I Mouse I Stylus and portable keyboard for smart phone or personal mobile device I Pen for graphics tablet I 48bit 1200 X 1200 ppi color scanner I 6 to lZmegapixel digital camera I Headphones that include a microphone headset I Web cam p 265 Fig 546 Putting It All Together What are recommended input devices for large business users p 265 Fig 546 Enhanced keyboard or ergonomic keyboard Mouse Stylus and portable keyboard for smart phone or other personal mobile device or digital penfor Tablet PC Touch screen Light pen 42bit 1200 X 1200 ppi color scanner 6 to lZmegapixel digital camera OCIVONIR readers bar code readers MICR reader or data collection devices Microphone Video camera for video conference s Fingerprint scanner or other biometric device Input Devices for Physically Challenged Users What input devices are available for those with physical limitations gt Keyguard allows users to rest hands on keyboard without accidentally pressing keys gt Head mounted pointer controls pointer on screen gt New developments include gesture recognition and computerized implant devices p 266 Figs 5 47
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