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Digital Devices lecture 5 Networks 1
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Digital Devices Agenda » Last class » Network Basics » The Internet » Internet Access
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Optical: tying up loose ends (optional) » CDDA ( Compact Disc Digital Audio ) » DVD-Video » CD-ROM » DVD-ROM » BD-ROM (cannot be re-written) 3 Laser beam “burning” pit: “0” land: “1” Reading 0 Reading 1
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Loose Ends: cont’d (optional) 4 » CD-R/DVD+R/DVD-R/ BD-R (Recordable ONCE) » CD-RW/DVD+RW/ DVD-RW (ReWritable) BD-RE (Recordable Erasable) Notice: The symbol ‘-’ is read, “dash” » Plus,+, and dash,-, just indicate different industry format standards » Some drives allow you to record in multiple sessions and from different sources, e.g., TV, PC » Drives marked as ± means accepting either format.
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Capacity & Drive Compatibility 5 Capacity Ratio (Roughly): CD, DVD and BD, respectively X 5x 25x Expect backward compatibility , i.e.: BD runs CD and DVD; DVD runs CD
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Connector Speed 6
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The Many Faces of USB and Apple’s Lightning(optional) 7 Type c VS Type A Notice reversibility Lightening VS Type C
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Questions 8 What is virtual memory? IoT? PC?
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True/False 9 » A microprocessor with 2.3 GHz is always better than a 1.5 GHZ one? » SSD is more durable than HDD?
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Digital Devices Section A: Network Basics » Communication Systems » Communication Channels » Network Topology » Network Nodes » Communication Protocols
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Digital Devices Networking : more than just sharing, more than just simple wiring 11
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Digital Devices Communication Systems » Networks can be classified in many ways; as a network user, you’ll want to keep in mind the idea of control and how it affects your privacy and security » A network links things together » A communication network (or communication system) links together devices to data and information can be shared among them
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Digital Devices Communication Systems » In 1948, Claude Shannon, and engineer at Bell Labs, published and article describing a communication system model applicable to networks of all types » His diagram illustrates the essence of a network: 1916-2001
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Digital Devices Communication Systems » Networks can be classified according to their size and geographic scope
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Digital Devices Communication Channels » A communication channel is the medium used to transport information from one network device to another » Wired channels transport data through wires and cables » Wireless channels transport data from one device to another without the use of cable or wires
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Digital Devices Communication Channels » Wired channels include twisted pair wires used for telephone land lines, coaxial cables used for cable television networks, Category 6 cables used for LANs, and fiber-optic cables used for high-capacity trunk lines
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Digital Devices Communication Channels: security » When you set up a wired connection, you don’t have to worry about hackers intercepting your data from outside your house » There are ways to tap into a wired network, but they require physical access to the cable or fairly sophisticated snooping equipment
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Digital Devices Advantages of Wired Communication Well-protected Dependa b l e: less noise secured
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Digital Devices Disadvantages of Wired Communication
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