Proof of Concept.doc

# Presenter many users one way av server bandwidth

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Presenter – Many Users One way A/V Server Bandwidth Client Bandwidth BWS = N * S BWC = S Proof of Concept Network Project Final ReportJanuary 2010 Page 36 of 55

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N = Number of Users S = Content encoded at constant bit rate S = Stream encoded at constant bit rate EG. 100 users at 100kbps 10 Mbps = 100kbps * 100 100 kbps You may want to vary the bandwidth for selected users that may be on a slower connection (dial-up modem users). Calculation could then be 6.9Mbps = (100 kbps * 50) + (38 kbps * 50) assuming half were on dial- up modem. Many to Many Example: 4 user conferencing room with all 4 using video and audio at the same time. Scenario Server Bandwidth Client Bandwidth BWS = (P * N ) * S BWC = P * S P = Number of publishers P = Number of publishers N = Number of Subscribers S = Content encoded at constant bit rate S = Stream encoded at constant bit rate EG. 4 users at 100kbps 1.6 Mbps = (4 * 4 ) * 100kbps 400 kbps = 4 * 100 kbps Example: 10 user conferencing room with all 104 using video and audio at the same time. Server Bandwidth Client Bandwidth BWS = (P * N ) * S BWC = P * S P = Number of publishers P = Number of publishers N = Number of Subscribers S = Content encoded at constant bit rate S = Stream encoded at constant bit rate EG. 10 users at 100kbps 10 Mbps = (10 * 10 ) * 100kbps 1000 kbps = 10 * 100 kbps Our Experience with conferencing rooms Presenter with 4 guest (Video and Audio) 306kbps Audio/Video Scenario Server Bandwidth (Out) Client Bandwidth Cameras running at 306kbps BWS = N * S BWC = S N = Number of Users S = Content encoded at constant bit rate S = Stream encoded at constant bit rate 10 Mbps = 306kbps * 4 306 = 306kbps Result Bandwidth 1224 kbps 306 kbps Observation Proof of Concept Network Project Final ReportJanuary 2010 Page 37 of 55
Quality of video is great. Frame rate is too slow. Latency about 350 to 500 milliseconds Could not use this for a conference if video is important. Audio delay is too high to hold a conversation Server is happy at 65% Meeting Room with 4 participants (Video and Audio) Scenario Server Bandwidth (Out) Client Bandwidth Cameras running at 306kbps BWS = (P * N ) * S BWC = P * S P = Number of publishers P = Number of publishers N = Number of Subscribers S = Content encoded at constant bit rate S = Stream encoded at constant bit rate 14.896 Mbps = (4 * 4 ) * 306kbps 1224 kbps = 4 * 306 kbps Observation Quality of video is great. Frame rate is OK. Latency about 350 to 500 milliseconds (But this doesn’t matter as much as only one way video and audio) Works well for a presenter Server is happy at 65% Presenter with 4 guest (Video and Audio) 70kbps Audio/Video Scenario Server Bandwidth (Out) Client Bandwidth Cameras running at 70kbps BWS = (P * N ) * S BWC = P * S P = Number of publishers P = Number of publishers N = Number of S = Content encoded at Proof of Concept Network Project Final ReportJanuary 2010 Page 38 of 55

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Subscribers constant bit rate S = Stream encoded at constant bit rate 1.12 Mbps = (4 * 4 ) * 70kbps 280 kbps = 4 * 70 kbps Observation Quality of video is adequate.
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