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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During a video-enabled WebEx meeting, a portion of the network bandwidth is consumed by the video bit streams 

that are being transmitted and received. The actual bandwidth consumption can be affected by admin or user- level 

settings and by network conditions. 

The test used BlackBerry Bold 9700 (BB). The traffic was monitored with the Mobile Data Alerter software. For 

iPhones and iPads, the testing team used the actual devices connected to a Mac and a traffic-monitoring tool to 

monitor data usage. PC tests were run with Window clients. All measurements were captured locally with the Iris 

Network Analyzer tool. The testing team also monitored the inbound and outbound HTTP traffic from the PCs and 
other devices to the Cisco Collaboration Cloud. Measurements were captured from both the presenter’s machine 
and the attendee’s machine. There was no significant difference in the bandwidth for data sharing; therefore tests 

related to data sharing assume both presenter and attendee traffic to be the same. 

All measurement results are in kilobits per second (kbps), not kilobytes (KB). File sizes are measured in kilobytes 

(KB). A byte is eight bits; a kilobyte is 1024 bytes. Eight bits multiplied by 1024 equals 8192 bits. Transmission 

rates are also measured in kilobits per second (not kilobytes). 

● 

Idle: Baseline network traffic in a meeting 

● 

Presentation share: Presenter shares a PowerPoint presentation with graphics and animations 

● 

Desktop share and application share: Presenter shares a desktop, running a PowerPoint presentation with 

30-second transitions 

● 

Internet phone (VoIP): Presenter and attendees have a conversation using PC microphones 

Table 7 gives the average bandwidth consumption for each of the video configurations. 

Average Bandwidth Consumption 

720p 

180p 

360p 

Six thumbs at 90p 

One 180p + six 
thumbs at 90p 

1750-2380 

330 

911 

- 

- 

1260-1820 

245 

635 

313 

482 

These results are for video traffic only; add an average of 70 to 150 kbps for VoIP traffic (send and receive). 

Table 8 summarizes the average measurements. Each measurement is dependent on what the camera sees. 

Video traffic will increase and can be reduced based on the moving subject. The audio traffic average should be 

added to the total average numbers. Data presentation traffic is variable and dependent on the shared content and 

change rate. Table 8 includes examples of the video bandwidth measured during the test, with faster-moving 

versus slow-moving or static subjects used in the test file. Note the minimal differences between the TCP and User 

Datagram Protocol (UDP) protocols used; however, note the bandwidth usage difference between the static 

subject and slow- and faster-moving video subjects.