Performance Analysis of Various Scheduling and Routing Techniques for Optical Network

Abstract

With recent advancements in greater network speeds and higher bandwidths, the online use of applications that support services such as VoIP, video conferencing, and File Sharing Protocol (FTP) have become more prevalent. While some applications such as web browsing (HTTP), email, and FTP are insensitive to the delay of transmitted information, VoIP and video conferencing are very sensitive to delay, packet losses, and jitter. Queuing disciplines are therefore implemented in routers to govern, control, sort, and to prioritize packets in the buffers prior to their transmission. FIFO, PQ, and WFQ queuing are implemented in OPNET and various parameters including : average queuing delay, average packet drop rate, MOS, jitter, and average end-to-end delay are studied and comparison of these parameters is made for the three queuing disciplines studied in order to pick the right queue for each application. Routing protocol is taking a vital role in the modern communication networks. A routing protocol is a protocol which is responsible to determine how routers communicate with each other and forward the packets through the optimal path to travel from a source node to a destination node. Open Shortest Path First (OSPF) is the pre-eminent routing protocols. OSPF is a link-state interior gateway protocol based on Dijkstra algorithm (Shortest Path First Algorithm). In the context of routing protocol performance, each of them has different architecture, adaptability, route processing delays and convergence capabilities. This thesis presents a simulation based comparative performance analysis between OSPF for real time applications by using OPNET. In order to evaluate OSPF performance, we have designed two network models. Our evaluation of proposed routing protocols is performed based on the quantitative metrics such as Convergence Time, Jitter, End-to-End delay, Throughput and Packet Loss through the simulated network models. An analysis of optical cross connect and couplers of high speed LAN in optical networks. In addition, simulation results compare the performance of high speed LAN with respect to the utilization of both optical cross connect and coupler. The delay and collisions occur in both networks have been examined. We have observed the performance and effect of both networks in case of sending and receiving frames. If the frame size is constant 1500 bytes v then the Traffic Received, Delay and Collision is high. But if we reduce the frame size from 1500 to 256 bytes, the performance is improved.