ece6607-6607[A]

ece6607-6607[A] - ECE 6607 Fall 10 Y. Wardi Office: VL E-478

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ECE 6607 Fall 10 Y. Wardi Office: VL E-478 ywardi@ee.gatech.edu (404) 894-8326 Office hours: Monday 2-3, Wednesday 10-12 Grading: Test 1, October 5 - 20% Test 2 , November 16 - 20% Homework – 10% Final – 50%
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Network architectures and protocols Layered architectures CEO CEO Secretary Secretary C. mail C. mail Mail
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n+1 entity n+1 entity n entity n entity n entity n entity n-PDU n-PDU
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n-SAP n-PDU n-PDU n-SDU n-SDU n-SDU H n-SAP n entity n entity n+1 entity n+1 entity
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I T H H T n-SDU n-PDU = n+1-SDU n+1-PDU Encapsulation
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Segmentation and Reassembly (SAR) n-SDU H H H H n-PDU n-PDU n-PDU n-PDU
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Architectures Open Systems Interconnection (OSI) TCP/IP (Internet) IEEE 802 (LAN) ATM
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OSI (ISO) 2. Data Link 1. Physical 3. Network 4. Transport 7. Application 5. Session 6. Presentation 2. Data Link 1. Physical 3. Network 4. Transport 7. Application 5. Session 6. Presentation 1. Physical 2. Data Link 3. Network 1. Physical 2. Data Link 3. Network
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Assignment of function to layers 1. Physical layer: transfer of bits across the communication channel Mechanical specs Electrical specs Functional specs Procedural specs 1. Data link layer: transfer of frames (blocks of information) across a transmission link Framing Error control Flow control 1. Network layer: Transfer of data packets across a communication network Routing Congestion control Flow control Internal network structure
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Assignment of functions to layers (cont.) 1. Transport later: End-to-end transfer of messages between hosts Segmentation and reassembly Setting up, maintaining, and clearing connections between session entities Error control Flow control 5. Session layer: control the session (dialog) 6: Presentation layer: presentation issues • Data presentation in machine-independent form • Encryption 7. Application layer: file transfer, virtual terminal (remote login), email, web browsing, etc
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ATM architecture Physical UI AAL ATM ATM Physical ATM Physical Physical ATM AAL UI AAL - ATM Adaptation Layer UI - User Information
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LAN architecture Client Logical link control (LLC) Medium access control (MAC) Physical
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TCP/IP Network Network IP Physical network Router Router Router Application TCP IP Physical network IP Physical network IP Physical network Application TCP IP Physical network
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Digital Transmission Digital representation of analog signals Fundamental limits in digital transmission Line coding Modems and digital modulation Error detection and correction
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Digital representation of analog signals Pulse Code Modulation (PCM) Differential PCM (DPCM) Linear Predictive Codes (LPC) Delta Modulation Sampling
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A -A 00 01 10 11 Transmitted signal: 010101010101010110100001 PCM, 4 quantization levels
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A -A Transmitted signal: 001011011011011011011010110110100010 PCM, 8 quantization levels 000 111 110 101 100 011 010 001
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Delta modulation 000 1 1 1 0 1 0 0 0 0 0 1 T Slope overload: when the sample of the continuous signal is not between the quantized levels preceding and following it
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Fundamental limits in digital transmission Nyquist signaling rate Shannon channel capacity
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ece6607-6607[A] - ECE 6607 Fall 10 Y. Wardi Office: VL E-478

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