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What is Real-time Communication in LAN?
A real-time system means the system is subjected to real-time that means the response should be guaranteed within a specified timing constraint or system should meet the specified deadline.
For example − Flight control system, real-time monitors etc.
Features of Real-time System
The features of real-time system are as follows −
Reliability − The system can operate for a long time without any interfere of the human
Manageability − In a real-time system the cost of implementation is to be reduced.
Performance − The system should be designed for the purpose of working easier and the workload should be reduced.
Predictability − Within the given time, the actions should be taken and the result to be produced by the system.
Real time communication
A real-time communication system (RTCS) is the backbone of distributed control applications. To support the timely completion of distributed real-time activities, RTCS must ensure bounded delivery delay for real-time messages.
Real Time systems are the system whose execution depends not only on the logical validity of data but also on its timeliness. A correct real time system will guarantee the successful operation of a system.
Subcategories of RT Systems
RT systems are generally divided into two main sub-categories which are as follows −
Hard Real-Time (HRT) − The incorrect operation can lead to catastrophic events that mean the errors in HRT systems which lead to accidents or even death. Such systems are generally found in flight control or train control systems, where an error could potentially incur loss of life.
Soft Real-Time (SRT) − An error in a SRT system will not cause loss of property or life. SRT systems are not as safety-critical as HRT systems, and should not be employed in a safety-critical situation.
For Example − Online reservation systems, streaming multimedia applications where slight occasional delays might cause small inconvenience but will not have serious impact.
Goals for Real-time Communication Techniques
All the methods of real-time communication aim to provide real-time message delivery with either low or zero loss rates (soft or hard real-time, respectively).
The goals for the real-time communication techniques are as follows −
Low jitter
Low latency
Ability to easily integrate non-real-time and real-time services
Adaptable to dynamically changing network and traffic conditions
Good performance for large networks and large numbers of connections
Modest buffer requirements within the network.
High effective bandwidth utilization.
Low overhead in header bits per packet or cell.
Low processing overheads per packet within the network at the end system.
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