Embedded Computers • An embedded computer is a special-purpose computer that functions as a component in a larger product Page 132 32 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Consumer electronics Home automation devices Automobiles Process controllers and robotics Computer devices and office machines
Embedded Computers Page 133 33 Figure 3-24 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Putting It All Together Page 134 34 Table 3-3 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Ports and Connections • A port is the point at which a peripheral device attaches to or communicates with a computer or mobile device so that the peripheral device can send data to or receive information from the computer or mobile device Page 135 35 Figure 3-25 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Ports and Connections • A connector joins a cable to a port. A connector at one end of a cable attaches to a port on the computer or mobile device, and a connector at the other end of the cable attaches to a port on the peripheral device Page 135 36 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Ports and Connections Page 135 37 Table 3-4 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Ports and Connections • A USB port, short for universal serial bus port, can connect up to 127 different peripheral devices together with a single connector • Instead of connecting peripheral devices directly to ports on a mobile computer, some mobile users prefer the flexibility of port replicators and docking stations Page 136 38 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Ports and Connections Page 137 39 Figure 3-26 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Ports and Connections • Instead of connecting computers and mobile devices to peripheral devices with a cable, some peripheral devices use wireless communications technologies Pages 137 - 138 40 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Bluetooth Wi-Fi NFC Uses short-range radio signals to transmit data between two Bluetooth-enabled computers or devices Short for wireless fidelity, uses radio signals. Near field communications uses close-range radio to transmit data between two NFC enabled devices.
Protecting Hardware • To help reduce the chances of theft, companies and schools use a variety of security measures – Physical access controls – Alarm system – Physical security devices – Security or device-tracking app – Require identification Page 139 41 Figure 3-27 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Protecting Hardware • Hardware can fail for a variety of reasons: aging hardware; random events such as electrical power problems; and even errors in programs or apps – Undervoltage – Overvoltage or power surge Pages 139 - 140 42 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
• An undervoltage occurs when the electrical supply or voltage drops, often defined as more than five percent, below the normal volts. • An overvoltage, or power surge, occurs when the incoming electrical supply or voltage increases, often defined as more than five percent, above the normal volts. © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 43
Protecting Hardware • A surge protector, also called a surge suppressor, uses electrical components to provide a stable current flow and minimize the chances of an overvoltage reaching the computer and other electronic equipment © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 140 44 Figure 3-28
Protecting Hardware • An uninterruptible power supply (UPS) is a device that contains surge protection circuits and one or more batteries that can provide power during a temporary or permanent loss of power © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 141 45 Figure 3-29
Health Concerns of Using Technology • A repetitive strain injury (RSI) is an injury or disorder of the muscles, nerves, tendons, ligaments, and joints • Computer vision syndrome (CVS) is a technologyrelated health condition that affects eyesight • Ergonomics is an applied science devoted to incorporating comfort, efficiency, and safety into the design of items in the workplace • Technology addiction occurs when the technology consumes someone’s entire social life Pages 142- 144 46 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Health Concerns of Using Technology Page 144 47 Figure 3-32 © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Summary Characteristics of and purchasing guidelines for laptops, tablets, desktops, smartphones, digital cameras, and portable and digital media players Servers, supercomputers, point-of-sale terminals, ATMs, self-service kiosks, e-book readers, wearable devices, game devices, embedded computers, and cloud computing Ports and connections Ways to protect hardware Health concerns of using technology and preventative measures © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 145 48
NETWORK AND COMMUNICATION CHAPTER 6
Objectives Overview Discuss the purpose of the components required for successful communications and identify various sending and receiving devices Differentiate among LANs, MANs, WANs, and PANs Differentiate between client/server and peer-topeer networks Explain the purpose of communications software Describe the various network communications standards and protocols © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 2 See Page 450 for Detailed Objectives
Objectives Overview Describe various types of communications lines Describe commonly used communications devices Discuss different ways to set up and configure a home network Differentiate among physical transmission media Differentiate among wireless transmission media © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 3 See Page 450 for Detailed Objectives
Students should be able to: • Identify various sending and receiving devices • Differentiate among LANs, MANs, WANs, and PANs • Describe commonly used communications devices © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 4
Communications • Digital communications describes a process in which two or more computers or devices transfer data, instructions, and information © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 450 5 •Sending device •Transmission media •Receiving device
© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 6 Sending device Initiates an instruction to transmit data, instructions or information Transmissio n media Or a communication channel, on which the data, instructions or information travel. Eg: Twisted-pair cable, coaxial cable and fiber optic cable. Receiving device That accepts the transmission of data, instructions or information
Communications © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 7 Page 451 Figure 10-1
Networks • A network is a collection of computers and devices connected together via communications devices and transmission media • Advantages of a network include: © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pages 452 - 453 8 Facilitating communications Sharing hardware Sharing data and information Sharing software Transferring funds
Networks © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 9 Page 452 Figure 10-2
Networks • A local area network (LAN) is a network that connects computers and devices in a limited geographical area such as a home, school, office building. • A wireless LAN (WLAN) is a LAN that uses no physical wires © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 10 Pages 453 - 454 Figures 10-3 – 10-4
Networks • A metropolitan area network (MAN) connects LANs in a metropolitan area • A wide area network (WAN) is a network that covers a large geographic area such as a city, country or the world. • A personal area network (PAN) is a network that connects computers and devices in an individual’s workspace with wired and wireless technology. Devices include smartphones, digital cameras, printers and more. © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 11 Page 455 Figure 10-5
Networks • The configuration of computers, devices, and media on a network is sometimes called the network architecture © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pages 456 - 457 12 Figures 10-6 – 10-7 Client/server network Peer-to-peer network
Network Communications Standards and Protocols Ethernet Token ring TCP/IP Wi-Fi Bluetooth UWB IrDA RFID NFC LTE © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 460 13
Network Communications Standards and Protocols Ethernet is a network standard that specifies no central computer or device on the network (nodes) should control when data can be transmitted The token ring standard specifies that computers and devices on the network share or pass a special signal (token) TCP/IP is a network protocol that defines how messages (data) are routed from one end of a network to another © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pages 460 - 461 14
Network Communications Standards and Protocols © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 461 15 Figure 10-8
Network Communications Standards and Protocols • Wi-Fi identifies any network based on the 802.11 standard that specifies how two wireless devices communicate over the air with each other • LTE is a network standard that defines how high-speed cellular transmissions use broadcast radio to transmit data for mobile communications • Bluetooth is a network protocol that defines how two Bluetooth devices use short-range radio waves to transmit data • UWB (ultra-wideband) is a network standard that specifies how two UWB devices use short-range radio waves to communicate at high speeds with each other • IrDA transmits data wirelessly via infrared (IR) light waves • RFID is a protocol that defines how a network uses radio signals to communicate with a tag placed in or attached to an object, an animal, or a person © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pages 462 - 465 16
Network Communications Standards and Protocols © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 17 Page 465 Figure 10-9
Network Communications Standards and Protocols © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 18 Page 466 Figure 10-10 • NFC (near field communication) is a protocol, based on RFID, that defines how a network uses close-range radio signals to communicate between two devices or objects equipped with NFC technology
Communications Lines Dedicated line Cable DSL ISDN FTTP T-Carrier ATM © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pages 466 - 468 19
Communications Lines © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 466 20 Table 10-2
Communications Devices • A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 468 21
Communications Devices • A broadband modem sends and receives data and information to and from a digital line © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pages 468 - 469 22 Cable modem DSL(Digital Subscriber Line) modem
Communications Devices © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 469 23 Figure 10-12
Communications Devices • A wireless modem uses a mobile phone provider’s network to connect to the Internet wirelessly from a computer or mobile device © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 469 24 Figure 10-13
Communications Devices • A wireless access point (WAP) is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 470 25 Figure 10-14
Communications Devices • A router connects multiple computers or other routers together and transmits data to its correct destination on a network © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 471 26 Figure 10-15
Communications Devices • Some routers provide additional functionality: – Wireless router – Broadband router – Broadband wireless router – Mobile broadband wireless router © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pages 471 – 472 Figure 10-16 27
Communications Devices • A network card enables a computer or device that does not have built-in networking capability to access a network • Available in a variety of styles © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pages 472 - 473 28 Figure 10-17
Communications Devices • A hub or switch is a device that provides a central point for cables in a network © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 473 29 Figure 10-18
Summary Networks and communications technologies Various types of network architectures and standards and protocols Communications software Several types of communications lines and communications devices How to create a home network Variety of physical transmission media and wireless transmission media © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Page 485 30
Chapter 10 Communicating Digital Content Discovering Computers 2016 Tools, Apps, Devices, and the Impact of Technology Chapter 10 Complete
THE INTERNET, WEBSITE AND MEDIA CHAPTER 7
Students should be able to: • Discuss the evolution of the Internet • Briefly describe various broadband Internet connections • List the types of websites • Know how the web uses graphics, animation, audio, video, and virtual reality • Explain how email, email lists, instant messaging, chat rooms, online discussions, VoIP, and FTP work • Find information on Internet of Things (IoT) technologies. © 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 2