Dynamic Continuous Presence (Cp) Mode; Continuous Presence (Cp) Conferencing - Polycom RMX 1500 Administrator's Manual

Dynamic Continuous Presence (CP) Mode

Continuous Presence (CP) Conferencing

The Continuous Presence mode offers 35 layouts to accommodate
different numbers of participants and conference settings including
support of the VUI annex to the H.264 protocol for endpoints that
transmit wide video instead of 4CIF resolution.
For conferences with more participants than display squares, the RMX
dynamic video mix capability allows the viewed sites to be modified
throughout the conference. The displayed layout can be changed during
an ongoing conference, allowing a participant to view different screen
layouts of the other conference participants. These layout options allow
conferences to have greater flexibility when displaying a large number of
participants and maximizes the screen's effectiveness.
Video quality in Continuous Presence mode is affected by the conference
line rate (that determines the maximum line rate to be used by the
connecting endpoints), and the video capabilities of the endpoints such as
the video protocol, video resolution and frame rate.
The video protocol selected by the system determines the video
compression standard used by the endpoints. In Continuous Presence
conferences, the system selects the best video protocol for the endpoint
according to its capabilities.
The following Video protocols are supported:
• H.261 - the video compression algorithm mandatory to all endpoints.
It is used by endpoints that do not support other protocols.
• 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 - 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 bit 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).
Chapter 2-Additional Conferencing Information
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