excel code barre ean 13 Inter-Group Media Streams in Software

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In addition to the intra-group switching already discussed, media stream channels can be directed between groups to create hybrid media processing configurations Under the media client's direction, the media stream channels between groups can be set as bidirectional or unidirectional in either direction There are three ways of interconnecting two groups: Attach Bridge Loopback The permissible interconnections are determined by the type of primary resource within each of the groups
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Attached An attached interconnection involves attaching one group (referred to as the secondary group) to another (the primary group) as if it were a secondary resource of the primary group Any group can be the primary, but the secondary group must contain a switch port resource
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Figure 7-12 Attached type connection
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Bridged A bridged interconnection involves establishing media stream channels between two groups such that each appears as a secondary resource of the other Any two groups7-11 can be connected in this manner
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Figure 7-13 Bridged type connection
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Loopback A loopback interconnection involves interconnecting the primary media streams of two groups Each group becomes the primary input for the other Both groups must contain a switch port resource Multiple groups can be interconnected through any combination of bridged, attached, and loopback connections as long as there are no circular media stream paths
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738 Group Configuration
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Media clients create groups by specifying a desired group configuration7-12 This consists primarily of a list of the resources that are desired in the group to be created Each resource is described in terms
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7-11
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Bridged conferences Two groups containing conference port resources should not be bridged together as this could lead to a feedback loop
Figure 7-14 Loopback type connection
of its desired attributes For example, a media client could request a group containing an ASR (automatic speech recognition) resource and could specify that it should support German language speakers and include support for echo cancellation The group configuration also specifies initial parameter settings for the group and all the individual resources The successful creation of the group simply indicates that all the desired resources exist and could be made available for use with the group However, the resources are not necessarily allocated, or reserved, for the media client
739 Static and Dynamic Resource Allocation
Before a media client can use a particular resource within a group that it owns, that resource must be allocated, or reserved and integrated into the group
7-12
Application profiles The ECTF S 100 specification defines application profiles that can be administered into a media service Application profiles include group configuration information for individual media clients
There are two resource allocation strategies: Static If a resource is statically allocated, it is allocated to a group as soon as the group is created and remains allocated to the group until the group is reconfigured or destroyed Dynamic If a resource is dynamically allocated, it is allocated to a group (along with the associated media stream channels) only when the media client issues a command that requires the presence of the resource
The advantage of dynamic resource allocation is that it prevents a media client from monopolizing scarce or valuable resources It also permits a media client to specify a configuration consisting of all the resources that it might require without actually allocating them until they are needed The disadvantage is that a required resource may not be available for allocation when it is actually required and the time to allocate a resource may create an unacceptable and unexpected delay in the media processing activity of a given group The resource allocation strategy of a given media service instance is implementation dependent Implementations may: Support only static allocation, Make certain resources subject to dynamic allocation, or Make all resources dynamically allocated After creating a new group a media client should check to see if any resources were dynamically allocated If so, it should take care to explicitly allocate the group's unallocated resources at some stage before they are actually needed
Because dynamic allocation has the potential for non-deterministic results, it is likely that the majority of implementations will support static allocation and rely on media clients to be efficient in their allocation of resources Media clients should not rely on dynamic allocation to make their media resource utilization efficient They should initially
only configure groups with necessary resources and then either reconfigure them or attach other groups when additional resources are required
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