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Data and Computer Communications by William Stallings Eighth Edition

This chapter introduces the fundamental elements of a communication system, including the roles of source, transmitter, transmission system, receiver, and destination. It explores the growth of computer interconnection, various network types like LAN and WAN, and switching technologies.

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Data and Computer Communications by William Stallings Eighth Edition

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  1. Data Communications, Data Networks, and the Internet Data and Computer Communications by William Stallings Eighth Edition Click to edit Master subtitle style Chapter 1 Networks and Communication Department

  2. A Communications Model • The fundamental purpose of a communications system is the exchange of data between two parties. This section introduces a simple model of communication, Figure 1.2. The key elements of this model are: • Source - generates data to be transmitted • Transmitter - converts data into transmittable signals • Transmission System - carries data from source to destination • Receiver - converts received signal into data • Destination - takes incoming data Networks and Communication Department

  3. A Communications Model Networks and Communication Department

  4. Communications Tasks Networks and Communication Department

  5. Data Communications Model Networks and Communication Department

  6. Networking • Growth of number & power of computers is driving need for interconnection • Also seeing rapid integration of voice, data, image & video technologies • Two broad categories of communications networks: • Local Area Network (LAN) • Wide Area Network (WAN) Networks and Communication Department

  7. Wide Area Networks • span a large geographical area • cross public rights of way • alternative technologies used include: • circuit switching • packet switching • frame relay • Asynchronous Transfer Mode (ATM) Networks and Communication Department

  8. Circuit Switching • uses a dedicated communications path established for duration of conversation • comprising a sequence of physical links • with a dedicated logical channel • eg. telephone network Networks and Communication Department

  9. Packet Switching • data sent out of sequence • small chunks (packets) of data at a time • packets passed from node to node between source and destination • used for terminal to computer and computer to computer communications Networks and Communication Department

  10. Circuit Switching vs. Packet Switching

  11. Frame Relay • packet switching systems have large overheads to compensate for errors • modern systems are more reliable • errors can be caught in end system • Frame Relay provides higher speeds • with most error control overhead removed Networks and Communication Department

  12. Asynchronous Transfer Mode • ATM • evolution of frame relay • fixed packet (called cell) length • with little overhead for error control • anything from 10Mbps to Gbps • constant data rate using packet switching technique with multiple virtual circuits Networks and Communication Department

  13. Local Area Networks • smaller scope • Building or small campus • usually owned by same organization as attached devices • data rates much higher • switched LANs, eg Ethernet • wireless LANs Networks and Communication Department

  14. Metropolitan Area Networks • MAN • middle ground between LAN and WAN • private or public network • high speed • large area Networks and Communication Department

  15. Internet evolved from ARPANET first operational packet network applied to tactical radio & satellite nets also led to standardized TCP/IP protocols The Internet

  16. Internet Elements Networks and Communication Department

  17. Summary • introduced data communications needs • communications model • defined data communications • overview of networks • introduce Internet Networks and Communication Department

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