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COE 341: Data & Computer Communications (T081) Dr. Marwan Abu-Amara

COE 341: Data & Computer Communications (T081) Dr. Marwan Abu-Amara. Chapter 1: Data Communications & Networking Overview. Acknowledgements. Many figures, slides, and course notes were made available by: Pearson Prentice-Hall Data & Computer Communications, W. Stallings McGraw-Hill

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COE 341: Data & Computer Communications (T081) Dr. Marwan Abu-Amara

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  1. COE 341: Data & Computer Communications (T081)Dr. Marwan Abu-Amara Chapter 1: Data Communications & Networking Overview

  2. Acknowledgements Many figures, slides, and course notes were made available by: • Pearson Prentice-Hall • Data & Computer Communications, W. Stallings • McGraw-Hill • Data Communications & Networking, B. Forouzan • Previous Course Offerings at KFUPM COE by: • Dr. Radwan E. Abdel-Aal • Dr. Ashraf Mahmoud • Dr. Taha Landolsi COE 341 – Dr. Marwan Abu-Amara

  3. Course Outline • Data Communications & Networking Overview (Ch. 1) • Protocol Architecture (Ch. 2) • Data Transmission (Ch. 3) • Guided and Wireless Transmission (Ch. 4) • Signal Encoding Techniques (Ch. 5) • Digital Data Communication Techniques (Ch. 6) • Data Link Control (Ch. 7) • Multiplexing (Ch. 8) COE 341 – Dr. Marwan Abu-Amara

  4. Agenda • Introduction • Communications Model • Main blocks and functionality • Communication Tasks • Data Communications • Data Communication Networking • Wide Area Networks • Circuit switching • Packet switching • Frame Relay • ATM • Local Area Networks COE 341 – Dr. Marwan Abu-Amara

  5. Introduction • Fundamental purpose of communications system is exchange of data between 2 parties • 3 general areas: • Data Communications (main concern of COE341) • Transmission of signals in reliable & efficient manner • Covers signal transmission, transmission media, signal encoding, interfacing, data link control, multiplexing • Networking • Covers technology & architecture of communication networks • Divided into LANs & WANs • Protocols COE 341 – Dr. Marwan Abu-Amara

  6. Simplified Communications Model - Diagram COE 341 – Dr. Marwan Abu-Amara

  7. A Communications Model • Source • Generates data to be transmitted • Transmitter • Converts data into transmittable signals (modulation, encoding, …) • Transmission System • Carries data • Receiver • Converts received signal into data (opposite to “Transmitter” role) • Destination • Takes incoming data COE 341 – Dr. Marwan Abu-Amara

  8. Communications Tasks COE 341 – Dr. Marwan Abu-Amara

  9. Simplified Data Communications Model • May involve buffering and/or encoding of digital data (Ch. 5) • Modulated signal, s(t), matched to media (Ch. 3 & 4) • Transmission Impairments: noise, distortion, etc. (Section 3.3) • Ideally received info, m’, should be identical to original input info, m (Ch. 7) • If not, error correction may help restore m (Ch. 7) • Else, retransmission is required (Ch. 7) COE 341 – Dr. Marwan Abu-Amara

  10. Networking • Point to point communication not usually practical • Devices are too far apart • Large set of devices would need impractical number of connections (full connectivity of N nodes is N (N – 1) / 2) • Solution is a communications network • Wide Area Network (WAN) • Local Area Network (LAN) COE 341 – Dr. Marwan Abu-Amara

  11. Wide Area Networks • Large geographical area • Rely in part on common carrier circuits • Alternative technologies • Circuit switching • Packet switching • Frame relay • Asynchronous Transfer Mode (ATM) COE 341 – Dr. Marwan Abu-Amara

  12. Circuit Switching • Dedicated communications path established for the duration of the conversation • e.g. telephone network COE 341 – Dr. Marwan Abu-Amara

  13. Packet Switching • Data sent out in sequence of small chunks (packets) of data • Packets passed from node to node between source and destination • Used for terminal to computer and computer to computer communications COE 341 – Dr. Marwan Abu-Amara

  14. Frame Relay • Packet switching systems have large overheads to compensate for errors • Modern systems are more reliable • Errors can be caught in end system • Most overhead for error control is stripped out • Variable-length packets (called frames) COE 341 – Dr. Marwan Abu-Amara

  15. Asynchronous Transfer Mode (ATM) • Evolution of frame relay • Combines circuit switching & packet switching • Little overhead for error control • Fixed-length packets (called cells) • Anything from 10Mbps to Gbps • Constant data rate while using packet switching technique COE 341 – Dr. Marwan Abu-Amara

  16. Local Area Networks • Smaller scope • Building or small campus • Usually owned by same organization as attached devices • Data rates much higher • Usually broadcast systems • Now some switched systems and ATM are being introduced COE 341 – Dr. Marwan Abu-Amara

  17. LAN Configurations • Switched • Switched Ethernet • May be single or multiple switches • ATM LAN • Fibre Channel • Wireless • Mobility • Ease of installation COE 341 – Dr. Marwan Abu-Amara

  18. Metropolitan Area Networks (MAN) • Middle ground between LAN and WAN • Private or public network • High speed • Large area COE 341 – Dr. Marwan Abu-Amara

  19. NetworkingConfiguration COE 341 – Dr. Marwan Abu-Amara

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