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Chapter 4 - Setting Up Conferences
4-22
inputs from the different endpoints. Transcoding is performed on the
following parameters: line rate, restricted/non-restricted, audio algorithm,
video format, video frame rate, aggregation mode (Bonding/H.221) and
different data rates.
Continuous Presence (CP)
A conference in which several participants can be viewed simultaneously. In
this type of session, each connected endpoint uses its highest video, audio and
data capabilities. This session type also enables special video layouts to be
selected for viewing the conference participants. The following categories of
video layout options are available: Classic, Quad Views and Software.
In Classic Continuous Presence conferences there are 21 basic layout options
available to display participants. Each participant uses a different video port
on the video card. This method enables such features as full Transcoding per
participant, Personal Layout (selection of Continuous Presence layout per
participant) and maintenance of overall video and audio quality for the
conference - even when participants with lower capabilities connect.
However, in the Continuous Presence-Classic video session, the number of
participants in a conference is limited by the type of video cards installed in
the MCU and by the total number of ports.
In Continuous Presence-Quad Views sessions, additional layouts intended for
large conferences (10+ participants) are available for selection. This mode is
available only with the Video+ card.
In Software Continuous Presence conferences, only two types of video layout
formats are available for selection: 2x1 and 2x2. If the conference includes
fewer than 5 participants, one of the layout windows is grayed out. Software
CP is a software solution for IP Only conferences that use fewer video card
resources by combining four incoming QCIF streams with fixed video bitrate
from four different participants into one outgoing CIF stream.
For a detailed description of CP conferences, see the MGC Manager User's
Guide, Volume II, Chapter 1, “Advanced Settings”.