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Digital Transmission Lecture o4 Advanced Computer Networks (ACN) 545

Mr. Thilak de Silva. BSc. Eng., MSc, CEng, FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA). Digital Transmission Lecture o4 Advanced Computer Networks (ACN) 545. Today's Agenda. Source coding methods Channel coding methods Data Compression Data Encryption Channelization Protocols

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Digital Transmission Lecture o4 Advanced Computer Networks (ACN) 545

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  1. Mr. Thilak de Silva. BSc. Eng., MSc, CEng, FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA) Digital TransmissionLecture o4Advanced Computer Networks (ACN) 545 M.Sc. in IT - Year 1 Semester II - 2012

  2. Today's Agenda • Source coding methods • Channel coding methods • Data Compression • Data Encryption • Channelization Protocols • Random Access Protocols • Control Access Protocols M.Sc. in IT - Year 1 Semester II - 2012

  3. Session Outcomes • At the end of this session you will have a basic understanding of source and channel coding methods, data compression and encryption, Channelization Protocols , Random Access Protocols and Control Access Protocols. M.Sc. in IT - Year 1 Semester II - 2012

  4. Source coding methods • Haffman coding • Shannon coding • Arithmetic coding M.Sc. in IT - Year 1 Semester II - 2012

  5. Channel coding methods • Forward Error Correction • Backward Error Correction • Hybrid Error Correction • combination of backward and forward error correction M.Sc. in IT - Year 1 Semester II - 2012

  6. Source, Channel and Line coding Source coding Channel coding Convert to signal Line coding M.Sc. in IT - Year 1 Semester II - 2012

  7. Data compression • Audio compression-MP3 • Image compression-JPEG • Video compression-MPEG M.Sc. in IT - Year 1 Semester II - 2012

  8. Data Encryption • Eg:- method colombo e q n q o d colombo • DES • RSA M.Sc. in IT - Year 1 Semester II - 2012

  9. Channelization Protocols • Channelization is a multiple access method in which the available bandwidth of the link is shared in time, frequency or through code between different stations. • Eg:- • Frequency Division Multiple Access – FDMA • Time Division Multiple Access – TDMA • Code Division Multiple Access – CDMA M.Sc. in IT - Year 1 Semester II - 2012

  10. Random Access Protocols • Random Access means each station has the right to the medium without being controlled by any other station. • Eg: • ALOHA • Slotted ALOHA • CSMA/CD • CSMA/CA M.Sc. in IT - Year 1 Semester II - 2012

  11. Control Access Protocols • Control access means the stations consult one another to find which station has the right to transmit. • Eg: • Reservation • Polling • Token Passing M.Sc. in IT - Year 1 Semester II - 2012

  12. Thank You… M.Sc. in IT - Year 1 Semester II - 2012

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