Cisco Cisco WebEx Meeting Center WBS30 White Paper
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Bandwidth Requirements in CMR Hybrid and CMR Cloud
Now let’s explore the requirements of a CMR Hybrid or CMR Cloud meeting. First we’ll discuss how the WebEx
Cloud operates specifically when bringing WebEx technology together with the telepresence participants
(Figure 2).
Figure 2. CMR Hybrid and CMR Cloud Connecting to Cisco WebEx Clients
Since we can send only a single bidirectional stream over
this gateway, we have the effect of choosing a “video
floor” for certain participants (Table 2). This video floor is encountered primarily by Cisco WebEx mobile and
desktop clients in CMR Hybrid that are not able to maintain a stable connection of ~1.3 mbps. (Mobile
requirements are slightly lower; see mobile bandwidth requirements in Table 5.)
Based on the periodic client test, users below the video floor will see a yellow triangle in the main video region of
the WebEx client and a low-bandwidth notification on mouse hover-over. This situation occurs only when a
telepresence user is the active speaker in the main video window, from the perspective of the WebEx client. When
a WebEx user is speaking to another WebEx user, that WebEx user will not experience this behavior; the normal
meeting experience between WebEx applications only is the norm. It is still possible, of course, for main video to
drop out with a yellow triangle in situations where communication is from one WebEx application to another, but
this drop-out occurs at a much lower bitrate.
WebEx Client Bandwidth Requirements (Desktop PC or Mac)
The list of possible layers in Table 2 is not an exhaustive list. In fact, there are additional video layers between
those mentioned. This list is merely a sampling of the experiences you can expect at various connected bandwidth
levels.
There are, however, many factors that go into which level a particular WebEx client chooses to send and receive,
in addition to available bandwidth. These factors include CPU speed and availability, available RAM, web camera
type and driver, and even user activity within the application. User activity variables include:
●
Is the person using the docked view?
●
Is the person using a dual-monitor mode with the video full screen on one monitor?
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Is the person currently the presenter?