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ECEN4533 Data Communications Lecture #30 25 March 2013 Dr. George Scheets

ECEN4533 Data Communications Lecture #30 25 March 2013 Dr. George Scheets. Read 18.1 & 18.6 Problems: Web 24, 8.3, 8.4 Quiz #2 next time (live); < 22 March (dl) Queuing Theory - Survivability. ECEN4533 Data Communications Lecture #32 29 March 2013 Dr. George Scheets. Read VoIP Tutorial

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ECEN4533 Data Communications Lecture #30 25 March 2013 Dr. George Scheets

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  1. ECEN4533 Data CommunicationsLecture #30 25 March 2013Dr. George Scheets • Read 18.1 & 18.6 • Problems: Web 24, 8.3, 8.4 • Quiz #2 next time (live); < 22 March (dl) Queuing Theory - Survivability

  2. ECEN4533 Data CommunicationsLecture #32 29 March 2013Dr. George Scheets • Read VoIP Tutorial • Exam #2, 11 April • Corrected Quizzes due 7 April

  3. 2013 OSU ECE Spring Banquet Sponsored in part by: • Hosted by Student Branch of IEEE • Wednesday, 17 April, at Meditations • Doors open at 5:30 pm, meal at 6:00 pm • Open Bar • Sign up in ES202 to reserve your seat(s) • $5 a head (for a $16 meal!) • if pay in advance and resume submittedto OSUIEEEresume@gmail.com< 5:00 pm, 15 April. Otherwise $8. • Speaker: Dr. Matt PerryDirector, SiArch • Dress is Business Casual • Many door prizes available!+10 points extra credit • All are invited!

  4. Sources of POTS delay Source CO PCM Coder POTS TSI Local Loop TDM Trunk Intermediate Digital Voice Switches Trunk resources (1 Byte every 1/8000th second) are dedicated to each voice call via TDM. ... PCM Coder POTS TSI Local Loop TDM Trunk Destination CO

  5. Sources of VoIP delay Voice Coder Packet Assembler Transmission Buffer Packet Switch Intermediate Packet Switches ... Trunk resources are randomly assigned to each voice call via Statistical Multiplexing. Voice Decoder Receiver Buffer Packet Switch StatMuxTrunks

  6. Voice Quality vs. Bit Rate Quality G.711 G.729 G.728 G.726 G.723.1 8 16 32 64 Bit Rate (Kbps)

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