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Polycom® RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
2-6 Polycom, Inc.
• H.263 - a video compression algorithm that provides a better video quality than H.261.
This standard is not supported by all endpoints.
• H.264 Base Profile - a video compression standard that offers improved video quality,
especially at line rates lower than 384 Kbps.
H.264 High Profile allows higher quality video to be transmitted at lower line rates.
• RTV - a video protocol that provides high quality video conferencing capability to
Microsoft OCS (Office Communicator Server) endpoints at resolutions up to HD720p30.
(SIP only).
Video Switching (VSW) Conferencing
In Video Switching mode all participants see the same video picture (full screen). The current
speaker is displayed in full screen on all the participants' endpoints, while the speaker sees
the previous speaker. Switching between participants is voice-activated; whenever a
participant starts to speak, he or she becomes the conference speaker and is viewed on all
screens. All conference participants must use the same line rate and video parameters such
as video protocol, frame rate, annexes and interlaced video mode as no video processing is
performed. Endpoints that are unable to meet these requirements connect as Secondary
(audio only).
Figure 2-2 AVC Video Switching (VSW) video streams and Full Screen Layout
Guidelines
• Only H.264 Base and High Profile video protocols are supported in Video Switching
Conferences.
• Video Switching conferences can be set to one of the following resolutions, depending
on the capabilities of the endpoints connecting to the conference:
— H.264 1080p60 (Symmetrically, at bit rates of up to 6Mbps).