time communication

The properties of scheme in real time communication have been analyzed. The proposed scheme has been proved to be capable of ensuring real time communication with a little sacrifice on sending time. After Seting up mathematical models I get the optimal values of sending time by the genetic algorithm toolbox based on Matlab 7.0.A improved programme was developed to improve the efficiency and latency assurance of fibre channel arbitrated loops. The node on the improved programme retrieves information from each arriving data frame and adds information to be sent to the frame. Simulations indicate that when all nodes on the relay loop need to send information, the efficiency reaches 100%.Since the communications do not need a wait period, the latency is assured so the system can be used in real time systems.Afterwards, the thesis implements the improved protocol based on NS-2 and designs simulation experiments. In this thesis, MATLAB program methods are used to accomplish statistical analysis of trace file data extraction and main attributes (latency) of network. The simulation results show that, in contrast with arbitrated loops, the improved arbitrated loops protocol improves average packet latency. It is especially applicable to the real time systems networks applications that require delay strictly.