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RTMMoIP

RTMMoIP. Alfredo Terzoli / Mosioua Tsietsi. A conversation becomes DATA. And it is tranported…. Another view!. VoIP bandwith calculation. Let’s get more specific on B/W usage, for AUDIO transmission Two families of CODECS: wave coding unrestricted, any sound (sound engineering)

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RTMMoIP

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  1. RTMMoIP Alfredo Terzoli / Mosioua Tsietsi

  2. A conversation becomes DATA

  3. And it is tranported…

  4. Another view!

  5. VoIP bandwith calculation • Let’s get more specific on B/W usage, for AUDIO transmission • Two families of CODECS: • wave coding • unrestricted, any sound (sound engineering) • vocoding • good for voice, can reach very low bitrates • kbps: kilo bits per second (here kilo=1000, not 1024!)

  6. ‘Vocoders’ for Videos?

  7. Voice Synthesisers & Vocoders • A voice synthesiser includes a vocoder of some type, naturally • In fact, using a voice synthesiser one can substantially reduce the bandwidth needed for the transmission of voice. HOW? • (BTW, who knows how MIDI works?)

  8. B/W consumption of a few codecs

  9. VoIP bandwith calculation

  10. VoIP bandwith calculation

  11. Bandwidth calculators at: • http://www.newport-networks.com/pages/voip-bandwidth-calculator.html (btw, the white paper distributed to you on b/w calculation comes from newport-networks) • http://www.packetizer.com/voip/diagnostics/bandcalc.html

  12. Reducing overhead • cRTP compact RTP (RFC 2508): • From 40 to 2 to 4 bytes, substantial • Trunking: same packet transport more than one conversation (of course, can be used only if on a trunk)

  13. Questions?

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