Conferencing Modes; Avc-Based Conferencing - Polycom RealPresence 800s Getting Started Manual

RealPresence Collaboration Server 800s/Virtual Edition Getting Started Guide

Conferencing Modes

The MCU system offers the following types of conferences (Conferencing Modes), based on the video
protocol and the video display during the conference:
● AVC-based Conferencing - CP Only (Video Transcoding)
● SVC-based Conferencing (Media Relay) - SVC Only
● Mixed AVC and SVC Conferencing - CP and SVC

AVC-based Conferencing

AVC-based Conferences allow endpoints that support AVC video to connect to these conferences. AVC
(Advanced Video Coding) video refers to the H.264 video protocols used to send and receive video. On the
Collaboration Server system it also includes all the standard video protocols such as H.261, H.263, and
RTV.
All endpoints (including SVC-enabled endpoints) have AVC capabilities and can connect to AVC
conferences running on the MCU. AVC-based endpoints can connect using different signaling protocols and
different video protocols.
Based on the video processing required during the conference, the Collaboration Server offers the
Continuous Presence Video Session Type for AVC-based conferencing.
CP Only (CP Transcoding) - AVC-based Conferencing
A transcoded CP (Continuous Presence) conference is also described as an AVC (Advanced Video Coding)
conference. It supports the standard video protocols. In this mode, video is received from all the endpoints
using different line rates, different transport protocols (SIP and H.323) and video parameters:
● Video protocols: H.263, H.264 Base and High profile and RTV
● Video Resolutions: from QCIF, CIF and up to 1080p
● Frame rates up to 30fps
By default every conference, Entry Queue and Meeting Room has the ability to declare the maximum CP
resolution as defined for the system.
The MCU processes the received video, transcodes it and sends the resulting video streams to the
endpoints.
The Continuous Presence (CP) conference enables viewing flexibility by offering multiple viewing options
and video cell layouts for video conferencing.
For more details, see Polycom® RealPresence Collaboration Server 800s/Virtual Edition Administrator's
Guide, AVC Conferencing.
AVC-based Video Resolutions
The resolution in which participants connect to the conference is determined by system according to their
connection line rate and the endpoint's capabilities.
Resolution Configuration for AVC-based CP Conferences
The minimum threshold line rates at which endpoints are connected to the conference at the various video
resolutions are determined in the Resolution Configuration dialog box. Using the Resolution Configuration
sliders, you can modify the video resolution decision matrix, effectively creating your own decision matrix.
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