Polycom RealPresence 1500 Administrator's Manual page 56

Conferencing Modes Overview
In a mixed CP and SVC conference, video resources are used according to the amount of both AVC and
SVC participants in the conference and according to the actual type of the conference - mixed CP and SVC
conferences or CP only conferences. The ratio of resources in a mixed conference is one AVC HD (720p30)
video resource to three SVC video resources, meaning for each AVC HD video resource, three SVC video
resources can be allocated.
In this resource capacity allocations example, the mixed CP and SVC conference can allocate a
combination of AVC and SVC ports depending on the endpoints that are defined in the actual conference.
For example, a conference can be defined as a mixed CP and SVC conference but will only allocate
resources as a mixed conference when both AVC and SVC endpoints join the conference. When there are
only one resource type of endpoints participating in the conference, such as AVC or SVC, the resource
allocations are assigned according to the type of endpoint with the system flag
MIX_AVC_SVC_DYNAMIC_ALLOCATION set to TRUE. For instance, a mixed CP and SVC conference
with HD endpoints assigned, can have 60 or 120 ports allocated depending on the server configuration.
When an SVC endpoint joins the conference, the conference becomes an actual mixed conference and the
resource allocations are divided between the AVC and SVC endpoints. The Resource Report will reflect this
by showing an increase in the resource usage.
The following diagram illustrates the amount of AVC to SVC port resources that are used in an actual mixed
CP and SVC conference:
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