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Digital Transmission Lecture o4 Advanced Computer Networks (ACN) 545

Mr. Thilak d e 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

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Digital Transmission Lecture o4 Advanced Computer Networks (ACN) 545

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  1. Mr. Thilakde 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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