Polycom® RMX 1800 Administrator’s Guide
3-2 Polycom, Inc.
—HD: The MCU transmits speaker resolution (including input from HD
participants) at up to SD resolution. If 1x1 is the requested layout for the entire
duration of the conference, set the conference to HD Video Switching mode.
• In asymmetrical Video Layouts:
—SD: A participant in the large frame that sends CIF is displayed in CIF.
—HD: Where participants’ video windows are different sizes, the Collaboration Server
transmits HD and receives SD or lower resolutions.
• In panoramic Video Layouts:
—SD: Participants that send CIF also receive CIF.
—HD: the Collaboration Server transmits HD and receives SD or lower resolutions,
the Collaboration Server scales images from SD to HD resolution.
H.264 High Profile Support in CP Conferences
The H.264 High Profile is a new addition to the H.264 video protocol suite. It uses the most
efficient video data compression algorithms to even further reduce bandwidth requirements
for video data streams.
Video quality is maintained at bit rates that are up to 50% lower than previously required.
For example, a 512Kbps call will have the video quality of a 1Mbps HD call while a 1Mbps
HD call has higher video quality at the same (1Mbps) bit rate.
Guidelines
•H.264 High Profile is supported in H.323, and SIP networking environments.
•H.264 High Profile is supported in Continuous Presence conferences at all bit rates, video
resolutions and layouts.
•H.264 High Profile is the first protocol declared by the Collaboration Server, to ensure
that endpoints that support the protocol will connect using it.
Setting minimum bit rate thresholds that are lower than the default may affect the video
quality of endpoints that do not support the H.264 High Profile.
• For monitoring purposes, the Collaboration Server and endpoint H.264 High Profile
capability is listed in the Participant Properties - H.245 and SDP tabs for H.323
participants and SIP participants respectively.
For more information see "IP Participant Properties” on page 12-15.
•H.264 High Profile is not supported:
—For Content Sharing
—With Video Preview
• HD1080p 60 is supported in Continuous Presence (CP) mode:
—In Motion Video Quality mode
—With maximum bit rate of up to 4 Mbps
—With a-symmetrical video qualities, the RMX receives HD720p60 and sends
HD1080p60.
• PAL endpoints are supported at a frame rate of 50 fps.
•Each HD1080p60 participant consumes 4 HD video resources.
H.264 High-Profile should be used when all or most endpoints support it.