Multimedia applications such as multimedia mail, collaborative works systems, virtual reliability systems etc required high speed networks with high speed transfer rate communication system.
The higher layer of multimedia communication system (MCS) can be divided into two architectural sub systems:
1.Application sub system:
2.Transport system:
There are many tools collaborative computing for example, email, bulletin boards use networks, screen sharing tools, text based conferencing system, IRC or internet relay chat, CompuServe, telephone conference system, conference room, video conferencing etc.
The session manager includes local and remote functionality. In local functionality it contains, membership control management such as participant authentication, control management for shared work space such as floor control, media control management such inter communication and synchronization among media agents and conference control management also such an communication establishment, modification and closing of conference.
In remote functionality the session manager, communicates with other session managers to exchange session state information which can include the ground information, configuration information etc. in several conferencing system, the conference control and also the floor control will be embedded either within the application layer or in session layer.
The higher layer of multimedia communication system (MCS) can be divided into two architectural sub systems:
1.Application sub system:
2.Transport system:
1. Application sub system:
This section prevents management and service issues for group collaboration and session management. The group collaboration and session management provide the support for a large group of multimedia applications such as tale-collaborations. The application subsystem can be discussed under two heading:a. Collaborative computing:
The collaborative computing is generally knows as computer supported co operative works (CSCW). The current infrastructure of networked computer along with audio and video makes it easier for people to co operative and bridge space and time in collaborative computing environments.There are many tools collaborative computing for example, email, bulletin boards use networks, screen sharing tools, text based conferencing system, IRC or internet relay chat, CompuServe, telephone conference system, conference room, video conferencing etc.
b. Session management:
It is an important part of multimedia communication architecture. It is the core part which separates the control from the actual transport, needed during the transport. Session management architecture is built around the session manager, which separates the control from the transport. The session control architecture, consist of a session manager, media agents and the shared work space agents.The session manager includes local and remote functionality. In local functionality it contains, membership control management such as participant authentication, control management for shared work space such as floor control, media control management such inter communication and synchronization among media agents and conference control management also such an communication establishment, modification and closing of conference.
In remote functionality the session manager, communicates with other session managers to exchange session state information which can include the ground information, configuration information etc. in several conferencing system, the conference control and also the floor control will be embedded either within the application layer or in session layer.
Media agent:-
Media agent are the separated for the session manager and are responsible for decision specific to each type of media. This modularity allows the replacement of agent where as shared work space agent transmits shared objects as like tale pointer co ordinate, graphical or textual object among the shared application.
2. Transport system:
These systems deal about multimedia transmission along with its application requirement. The multimedia application in network environment requires the following four aspects for the data holding in computing and communications.a. Data through put (transfer rate):
Audio or video data shows a stream like behavior. It requires high data throughput even in compressed mode. These stream exist concurrently in work station or network, requires a high throughout. Data movement on local end system produces manipulation of large quantity of data in real time and can create a bottleneck in the system.b. Fast data forwarding:
It imposes a problem on end system where different application exists in the same end system. Each application requires ranging from normal error free data transmission to new time constraint traffic type traffic, but the faster a communication can transfer a few data packet need to be buffered. This movement results in a careful spatial and temporal resources management within the end system and routers or switches. This causes end to end delay. The delay of one second may be tolerated, where as in video phone or video conference, the delay should be lower than 200 m/s for natural communication.c. Service guarantees:
to achieve services guarantee, resource management most be used without resources management in end system and switches/routers, multimedia system can not provide reliable QOS (quality of service) to their user because transmission over unreserved resources leads to be dropped or delayed packets.d. Multicasting:
It is important requirement for multimedia distributed application in terms of sharing resource like networks and communication protocol processing at end system.