1 / 31

Data Comm & Local Area Networks (TCOM 501) Wide Are Networks & Internet (TCOM 502)

Data Comm & Local Area Networks (TCOM 501) Wide Are Networks & Internet (TCOM 502). George Mason University School of Information Technology & Engineering. Agenda. 1. INTRODUCTION 2. E-MAIL ADDRESSES 3. SYLLABUS REVIEW A. GRADING STANDARDS B. RESEARCH PAPER REQUIREMENTS

reid
Download Presentation

Data Comm & Local Area Networks (TCOM 501) Wide Are Networks & Internet (TCOM 502)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Data Comm & Local Area Networks (TCOM 501)Wide Are Networks & Internet (TCOM 502) George Mason University School of Information Technology & Engineering

  2. Agenda 1. INTRODUCTION 2. E-MAIL ADDRESSES 3. SYLLABUS REVIEW A. GRADING STANDARDS B. RESEARCH PAPER REQUIREMENTS C. ADVOCACY PRESENTATIONS D. SUPPLEMENTAL READING 4. HOMEWORK ASSIGNMENTS 5. QUIZES 6. THE BOOK’S RELATIONSHIP TO THE COURSE A. FORMULAS 7. CHAPTERS 1 & 2

  3. Homework 1-1 through 1-5 2-2, 2-7, 2-12 3-10 through 3-15

  4. Research Paper Substitute IBM has a processor that operates at 200 GHz. What is the fastest fiber optic transmission speed that will support? What is the impact if the RAM access speed for a cycle is 60 nanoseconds, the hard drive access speed is 10 milliseconds and the bus speed is 133 MHz? Which of these is easiest to change?

  5. Optional Case Study The following case study may be done in lieu of a research paper. It should be performed by two to four students working as a team. Two reports (one for 501 & one for 502) should be approximately 20 pages long and show graphical illustrations of the test performed and results found. An oral presentation should be given as a team. Take three computers (e.g. 486, 586 and Pentium II) and link each to a server. Place at least three applications on each platform (e.g. e-mail, access database and a graphics application). Develop a test methodology and determine: 1. What is the weak link (slowest component in each platform and the slowest component overall)? 2. What is the response time (user-to-user) of the fastest and slowest application? 3. What is the recommended bechmarking tool to perform the analysis?

  6. Figure 1-1 Data Communication System Components

  7. Figure 1-2 Network Criteria

  8. Figure 1-3 Categories of Standards

  9. Standards • Agreed Principles • De Jure • EIA (RS232) • ANSI (X.25) • ITU-T (CCITT) - (X & V Series “Recommendations”) • De Facto • IBM, Bell System, et.al.

  10. Protocol • A set of Rules Used to Enable Data Communications • Procedures for Adding Order to the Exchange of Data • Rules Relating to the Timing and Format of Data Transmissions • Standard Procedures that Devices Must Accept and Use

  11. Interfaces & Services Interface Data Unit Interface Control Info Service Data Unit Service Access Point Protocol Data Unit IDU Layer N+1 Interface Layer N ICI SDU SAP ICI SDU Header SDU N-PDU

  12. Services Service Example Reliable message stream Sequence of pages Reliable byte stream Remote login Unreliable connection Digitized voice Unreliable datagram Electronic junk mail Acknowledged datagram Registered mail Request-reply Database query

  13. Service Primitives Primitive Meaning Request An entity wants the service to do some work Indication An entity is to be informed about an event Response An entity wants to respond to an event Confirm The response to an earlier request has come back

  14. Layers In The OSI Stack Application Presentation Session Transport Network Data Link Physical

  15. Process 1 Computer 1 The Market Dropped!Sell! A Pr S T N DL Ph 7 6 5 4 3 2 1 P(1)OS-SQ P(2,3,4,5) Add $, Compress P(1)OS-SQ P(n) C(1)P(1)OS-SQ C(n)P(n) C(1)P(1)OS C(n)P(n) C(1)P(1)SQ C(n)P(n) HHC(1)P(1)OS C(n)P(n) HHC(1)P(1)SQ C(n)P(n) GW 7 6 5 4 3 2 1 7 6 5 4 3 2 1 1 P5 on C5 P3 on C3 P2 on C2 P4 on C4 3 2 1 7 6 5 4 3 2 1 2 1 7 6 5 4 3 2 1 7 6 5 4 3 2 1 Router Bridge

  16. TCP/IP and the OSI Model

  17. Do It Yourself

  18. WHO • Naming - Addresses • Size • Format • Aliases • Interconnection

  19. Addressing Curly Larry Jim Mo

  20. HOW • Connections • Type • Linkage • Bandwidth • More Names

  21. Connectivity A E Curly Larry C B F D Jim Mo

  22. WHEN • Timing & Synchronization • Channel Availability • Device Availability • Batch vs. Real Time

  23. Timing & Spacing 2 1 A E Curly Larry C B F X D Jim Mo

  24. WHAT • Payload • Character • Block • Packet/Frame • Assemble/Disassembly

  25. Packets TO FROM # of # data…...

  26. HOW • Routing • Quality Assurance • Data Integrity • Error Handling

  27. Routing 2 1 A E Curly Larry C 3 B 4 F D Jim Mo

  28. Decibells & Logarithms Converting watts to dB (or milliwatts to dBm): 10 log10 1000 watts = 30 dBw Converting dB to watts (or dBm to milliwatts): 30 dBw = log-1, or log-1 (3) or 10 raised to the 3rd power = 103 = 1000 watts 35 dBw = 103.5 = 3162.3 watts Note: There’s a point between the 3 & 5.

  29. Decibells & Logarithms dBW Watts -3 .5 0 1 3 2 6 4 9 8 10 10 20 100 30 1000 40 10000

  30. Nyquist 1. Nyquist: The maximum practical data rate (samples) per channel. Max R = 2 H log2 V Logarithmic function to the base 2: For each # V, log V = the exponent to which 2 must be raised to produce V. Then if V = 16, the log2 of V = 4. If V = 2, the log2 of V = 1. Then what is the maximum practical data rate for BPSK signal on a line with a bandwidth of 3000 Hz? What is the maximum practical data rate for a QPSK signal on a line with a bandwidth of 3000 Hz?

  31. Shannon Shannon: The maximum theoretical data rate per channel. Max R = CBW x log2 (1 + S/N) [CBW = H in Nyquist Theorem] Then what is the maximum practical data rate for signal with a 30 dB S/N on a line with a bandwidth of 3000 Hz?

More Related