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Friday, July 26, 2013

PPT On Multimedia Networking System

Presentation On Multimedia Networking System

Multimedia Networking System Presentation Transcript:
1.Multimedia Networking System

A multimedia networking system allows for the data exchange of discrete and continuous media among computers. This communication requires proper services and protocols for data transmission. Multimedia networking enables distribution of media to different workstation.

3.Layers , Protocols & Services
A service provides a set of operations to the requesting application. Logically related services are grouped into layers according to the OSI reference model. Therefore, each layer is a service provider to the layer lying above. The services describe the behaviour of the layer and its service elements (Service Data Units = SDUs). A proper service specification contains no information concerning any aspects of the implementation.

Protocol consists of a set of rules which must be followed by peer layer instances during any communication between these two peers.

It is comprised of the formal. (syntax) and the meaning (semantics) of the exchanged data units (Protocol Data Units =PDUs). The peer instances of different computers cooperate together to provide a service.

5.Physical Layer
The physical layer defines the transmission method of individual bits over the physical medium, such as fiver optics.

6.Data Link Layer
The data link layer provides the transmission of information blocks known as data frames. Further, this layer is responsible for access protocols to the physical medium, error recognition and correction, flow control and block synchronization.

7.Network Layer
The network layer transports information blocks, called packets, from one station to another. The transport may involve several networks. Therefore, this layer provides services such as addressing, internetworking, error handling, network management with congestion control and sequencing of packets.

8.Transport Layer
The transport layer provides a process-to-process connection. At this layer, the QoS , which is provided by the network layer, is enhanced, meaning that if the network service is poor, the transport layer has to bridge the gap between what the transport users want and what the network layer provides.
 Large packets are segmented at this layer and reassembled into their original size at the receiver. Error handling is based on process-to-process communication.

9.Session Layer
In the case of continuous media, multimedia sessions which reside over one or more transport connections, must be established. This introduces a more complex view on connection reconstruction in the case of transport problems.

10.Presentation Layer
The presentation layer abstracts from different formats ( the local syntax) and provides common formats ( transfer syntax). Therefore, this layer must provide services for transformation between the application-specific formats and the agreed upon format.
An example is the different representation of a number for Intel or Motorola processors.

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