Polycom RealPresence 2000, Руководство администратора

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Polycom® RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
4-12
Polycom, Inc.
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.
In SVC Only conferences, endpoints that do not support the required content parameters
( Content line rate and Content Resolution) cannot share content.
Guidelines
• In Cascading conferences, the cascade link must be H.323.
• This is the only available Content sharing mode in SVC Conferencing Mode and CP and
SVC Conferencing Mode .
• H.323 , SIP and ISDN participants are supported in AVC CP Conferencing Mode .
• H.264 High Profile is not supported.
• In MPM+ Card Configuration Mode , maximum supported content resolution is HD 720p.
• When H.264 Cascade and SVC Optimized is selected in AVC CP Conferencing Mode, the
Send Content to Legacy Endpoints selection is enabled by default in the Conference Profile –
Video Settings dialog box.
• In AVC Conferencing Mod e, endpoints that cannot connect at a line rate required to
support the conference Content Rate are considered Legacy Endpoints and will receive
Content in the video channel.
• In SVC Conferencing Mod e, Endpoints that cannot connect at a line rate required to
support the conference Content Rate will receive Content in the video channel.
• Gathering Phase is not supported in Cascading Conferences .