And digital signals 12 communications media and

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Unformatted text preview: dia and Channels Twisted-pair wire Coaxial cable Fiber optics Sources: deepspacedave/Shutterst ock, GIPhotoStock/Photo Researchers, Inc, Philip Hatson/Photo Researchers 13 Transmission Transmission Technologies Digital subscriber line (DSL) High-speed, digital data transmission technology using existing analog telephone lines using existing analog telephone lines Asynchronous transfer mode (ATM) Transmission technology using packet switching gy and enables almost unlimited bandwidth on demand Synchronous optical network (SONET) Interface standard for transporting digital signals over di fiber optic lines; enables users to integrate transmissions from multiple vendors. T-carrier system Digital transmission system, it defines circuits that operate at different rates all of which are multiples of the operate at different rates, all of which are multiples of the basic 64 Kbps user to transport a single voice call. 14 Network Network Protocols Protocol: A set of rules and procedures governing governing transmission across network transmission across a network Think: Stoplight Ethernet: A common LAN protocol Transmission Control Protocol/Internet Protocol (TCP/IP): a file transfer protocol that can send large files of information across sometimes unreliable networks with ti assurance that the data will arrive uncorrupted uncorrupted 15 Layers: Engineering approach to simplify, rationalize, enable control of complexity The The Four Layers of the TCP/IP Protocol The four layers of TCP/IP (Source: Dabroost/Shutterstock) 16 Packet Switching Packet Switching 17 Types of Network Processing Types of Network Processing Client/server computing © Matthias Pahl/Age Fotostock America, Inc. Peer-to-peer processing © Toh Kheng Ho/Age Fotostock America, Inc. 18 The Internet and the World Wide Web The Internet and the World Wide Web Accessing the Internet 1. Connecting via an online service 2. Internet kiosks 3. Dial-up 4. DSL 5. Cable Modem 6. Satellite 7. Wireless Wireless 8. Fiber to the Home Distinguish: Internet, intranet, extranet 19 WWW WWW -- The World Wide Web The World Wide Web: A system of universally accepted system of universally accepted standards for storing, retrieving, formatting, and displaying information via a client/server architecture. WWW ≠ Internet Home page page Uniform resource locator © Ilin Sergey/Age Fotostock America, In 20 All are work processes & systems: To be designed by IEs; to be used by IEs Network Network Applications / Roles / Categories 1. 2. 3. 4. 5. 6. Discovery Communication Collaboration E-Learning and Distance Learning Virtual Universities and Communities Telecommuting 21 Browse – Search – Think – Find – WOW!!! Role 1: Discovery Role 1: Discovery Search engines engines Metasearch engines Discovery of material in foreign languages of material in foreign languages Portals 22 Portals Portals ◦ Commercial (public) portals ◦ Affinity portals – support communities ◦ Mobile portals ◦ Corporate portals ◦ Industr...
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