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Polycom® RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
4-12 Polycom, Inc.
Example
Table 4-6 summarizes an example of two participants trying to connect to a conference
running at a Line Rate of 1024Kbps. The Content Setting for the conference is Hi Resolution
Graphics and the H264_HD_HIGHRES_MIN_CONTENT_RATE System Flag setting are
used to determine if Content will be shared with the participant.
H.264 Cascade and SVC Optimized
The H.264 Cascade and SVC Optimized option maintains content quality and minimizes
the amount of content refreshes that occur in large cascading conferences when participants
connect or disconnect from the conference.
This option is the only available option automatically selected in SVC Only conferencing
Mode and mixed CP and SVC Conferencing Mode.
The H.264 Cascade and SVC Optimized option uses fixed resolution and frame rate for SVC
Only and mixed CP and SVC conferences. In AVC CP conferences, each content Line Rate
and Content Setting has its own resolution and frame rate as summarized in Table 4-8.
In AVC CP conferences, endpoints that do not support the required content parameters
(Content line rate, H.264 protocol and Content Resolution), along with ISDN endpoints, can be
connected as Legacy Endpoints and receive content through their video channel. This ensures
that Content settings are not changed following the participants connection or disconnection
from the conference. If the Send Content to Legacy Endpoints option is disabled, these
endpoints will not receive content.
Table 4-6 Participant Content Sharing Based on Connection Line Rate and System Flag Setting
Participant Conference
Flag
Value
Result
Line Rate Bit Rate
Allocation
to
Content
Channel
(Table 4-4)
Line Rate Bit Rate
Allocation
to
Content
Channel
(Table 4-4)
Participant 1
384 192
1024 384
128
Participant and
entire conference
share content at
192Kbps
512
Participant
receives content
in the video
channel (Legacy)
Participant 2
1024 384
128
Participant and
entire conference
share content at
384Kbps
512
Participant and
entire conference
share content at
384Kbps