Polycom RealPresence RMX 4000, Руководство администратора

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Conferencing Modes Overview
Polycom®, Inc. 19
in the configured layout, the endpoint requests the video stream in the required resolution from the
RealPresence Collaboration Server. The higher the display quality and size, the higher the requested
resolution will be sent to the endpoint. The endpoint creates the displayed layout from the different video
streams it receives.
For instance, an SVC endpoint might want to receive three video streams at different frame rates and
resolutions, and create a conference layout with the received video streams. Each SVC-enabled endpoint
sends encoded SVC bit streams to the MCU to relay to the other SVC-enabled endpoints in the conference.
The endpoints encode the video in multiple resolutions and decodes the multiple video input streams.
For example:
RealPresence mobile client ( 2 ) will transmit two resolutions; one that is suited for RealPresence Desktop
client ( 3 ) and a second that is suited for two other endpoints: RealPresence Desktop client ( 4 ) and ( 1 ).
RealPresence Desktop client ( 1 ) transmits two resolutions; one that is suited for RealPresence Mobile client
( 2 ) and a second that is suited for RealPresence Desktop client ( 4 ).
The MCU determines which of the incoming resolutions to send to each endpoint. It does not perform any
SVC encoding and decoding, or any transcoding of the video streams. The RealPresence Collaboration
Server functions as the multipoint media relay to the endpoints. For voice activated selection of the video
streams, the RealPresence Collaboration Server determines which of the incoming bit streams to send to
each endpoint.
Advantages of SVC Conferencing
SVC increases the scalability of video networks and enables mass desktop video deployments. Some of
the advantages of SVC conferencing are:
●
Offers high-resolution video conferencing with low end-to-end latency, improved error resiliency and
higher system capacities.
●
Allows the SVC-enabled video endpoints to manage display layouts, supporting multiple line rates,
resolutions and frame rates.
●
The RealPresence Collaboration Server functions as a media relay server providing low cost
production benefits. The RealPresence Collaboration Server reduces bandwidth usage by only
selecting the necessary video stream to be sent to the endpoints.
SVC Conferencing Guidelines
You can run SVC-based conferences when following the guidelines listed below.
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SVC conferences are supported only with the following:
 SVC Licensing
 SIP over UDP signaling
 SIP over TLS Signaling
 Polycom SVC-enabled endpoints (Polycom® RealPresence® Desktop, Polycom®
RealPresence® Mobile)

Ad Hoc conferencing via Meeting Rooms and ongoing conferences
●
SVC Only conferences can run on the same MCU as AVC Only conferences.