Cisco Cisco WebEx Meeting Center WBS30 Libro bianco

 

 

© 2015 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. 

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Scenario 1: Three participants in the meeting, all capable of sending and receiving video at 360p: 

● 

Multipoint video window (360p) plus two (90p) thumbnails on received view 

● 

Send: 900 from webcam = 900 (one Mbps) average per participant for video stream 

● 

Receive: 600 plus (2 x 40) = 680 (0.7 Mbps) average per participant for video stream 

Explanation: Each client will try sending an average of 1 Mbps or up to a maximum of the 1.5 Mbps of data. Each 

client will also receive an average of 600 kbps or up to a maximum of the 1 Mbps of data. The receiving client can 

also use additional bandwidth for the thumbnail views if enabled (2 x 4 0 kbps on average). To use additional 

bandwidth, the data-sharing portion (kbps are hard to predict) and possible WebEx VoIP usage (70-150 kbps if 

enabled) must be added. 

Scenario 2: Eight participants in the meeting with 180p video (non-HQ): 

● 

Multipoint video window (180p) plus six (6 x 90p) thumbnails received view 

● 

Send: 320 from webcam equals 320 kbps (0.3 Mbps) average per participant for video stream 

● 

Receive: 250 plus (6 x 40) = 490 kbps (0.5 Mbps) average per participant 

Explanation: HQ video is disabled. Each client will send 350 kbps on average, or up to 0.5 Mbps maximum. Each 

client will receive an average 250 kbps for the main active speaker window plus an optional six thumbnails (6 x 40) 

average equal to 0.5 Mbps on average on the receiving side per participant with thumbnail view enabled. For this 

scenario, the data-sharing portion (kbps are hard to predict) and possible WebEx VoIP usage (70-150 kbps, if 

enabled) must be added. 

Actual sending and receiving bit rates are independent of which multimedia file format is used. Before 

transmission, shared multimedia content is first extracted and transcoded into an H.264 SVC bit stream. When the 

participating client receives the bit stream, the stream is decoded and then rendered by the video engine for 

display. Average bandwidth usage measurements are listed in Table 10. 

Average Bandwidth Used 

Sender traffic (kbps) 

932 

1282 

Receiver traffic (kbps) 

697 

989 

Sender traffic (kbps) 

984 

1271 

Receiver traffic (kbps) 

730 

976 

Sender traffic (kbps) 

1225 

1261 

Receiver traffic (kbps) 

906 

968 

Sender traffic (kbps) 

980 

1273 

Receiver traffic (kbps) 

723 

964 

Sender traffic (kbps) 

- 

96 (audio only) 

Receiver traffic (kbps) 

- 

96 (audio only)