RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

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Polycom RMX 1500/2000/4000 Administrator’s Guide H.239 / People+Content H.239 People+Content The H.239 protocol allows compliant endpoints to transmit and receive two simultaneous video streams: • People Conference – Continuous Presence or Video Switched conference • Content Conference – Video Switching conference for content sharing By default, all conferences, Entry Queues, and Meeting Rooms launched on the RMX have H.239 capabilities. To view Content, endpoints must use the same Bit Rate, Protocol, and Resolution. An endpoint may not send Content while connecting to an Entry Queue. Endpoints without H.239 capability can connect to the video conference without Content. Cascade links declare H.239 capabilities and they are supported in Star and MIH cascading topologies. For more details, see "Cascading Conferences - H.239-enabled MIH Topology” on page 4-27. People+Content utilizes a different signaling protocol and is Polycom’s proprietary equivalent of H.239. Guidelines • All network environments are supported. • Conferences can include a mix of endpoints that support H.239 or People+Content. • All endpoints will receive Content at the highest resolution common to all connected endpoints. • SIP People+Content is supported with MPM+ and MPMx cards. • H.239 is supported in MIH, Star and Basic Cascading topologies. • People+Content is supported in cascaded conferences but cannot be used as the protocol for a cascade link. • If an endpoint supports both H.239 and People+Content protocols, H.239 is selected as the preferred communications protocol. • H.263 Annex T and H.264 protocols are supported for Content transmission. • People+Content is enabled by default. It can be disabled for all conferences and endpoints by manually adding the ENABLE_EPC System Flag to the System Configuration and setting its value to NO (default setting is YES). • Endpoints that support People+Content (for example, FX endpoints) may require a different signaling protocol. For these endpoints, manually add the System Flag CS_ENABLE_EPC to the System Configuration and set its value YES (default value is NO). • Content sharing is not supported in Microsoft ICE environment (BFCP protocol). • Video endpoints that do not support SIP Content (such as PVX), can receive Content on the People channel if the conference is set to Send Content to Legacy Endpoints. For more details see, "Sending Content to Legacy Endpoints” on page 3-12. 3-2 Polycom, Inc.
Content Transmission Mode Content Settings Chapter 3-Additional Conferencing Information The Content channel can transmit one of the following modes: • Graphics – default mode, for standard graphics • Hi-res Graphics – requiring a higher bit rate, for high quality display or highly detailed graphics • Live Video – highest bit rate, for video clips or live video display The highest common Content bit rate is calculated for the conference each time an endpoint connects. Therefore, if an endpoint connects to an ongoing conference at a lower bit rate than the current bit rate, the Content bit rate for the current conference is re-calculated and decreased. Bit rate allocation by the MCU is dynamic during the conference and when the Content channel closes, the video bit rate of the People conference is restored to its maximum. During a conference the MCU will not permit an endpoint to increase its bit rate, it can however change its Content resolution. The RMX can decrease the allocated Content bit rate during a conference. Table 3-1 summarizes the bit rate allocated to the Content channel from the video channel in each of the three Content Transmission Modes according to the conference line rate: Table 3-1 Decision Matrix - Bit Rate Allocation to Content Channel per Conference Line Rate Content Bit Rate Allocation per Conference Line Rate (kbps) 64 96 128 256 384 512 768 832 Table 3-2 summarizes the Maximum Resolution of Content and Frames per Second (fps) for Bit Rate Allocations to the Content Channel as set out in Table 3-1. Polycom, Inc. 3-3 1024 1152 1472 1728 1920 2048 4096 6144 Graphics 64 64 128 128 256 256 256 256 512 1152 1536 Hi Resolution Graphics 64 128 192 256 384 384 512 768 768 1536 1536 Live Video 64 128 256 384 512 768 768 1152 1152 1536 1536 Table 3-2 Content - Maximum Resolution, Frames/Second per Bit Rate Allocation Bit Rate Allocated to Content Channel (Kbps) Content Maximum Resolution Frames/Second From 64 and less than 512 H.264 HD720p 5 From 512 and less than 768 H.264 HD720p 30 From 768 and up to 1536 H.264 HD1080p 15
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RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

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