Comparative Topology Study on a Fiber Optics Local Area Network in Jimma Institute Technology

Abstract

Local area network is a small area computer network by interconnecting devices; they are data terminal equipment and data converting equipment. LAN is the end connection it may be logically or physically after router to client with different topology. Therefore multimode optical fiber is the logical choice for Storage Area Networks and Local Area Networks. In JIT LAN for backbone transmission implemented by optical fiber, but is not efficient work and there is some resource wastage and less fault protection topology. There is design gap in network; it needs high emphasis to design and implementation. JIT campus has many buildings each building should connected by LAN network, totally optical fiber backbone, seventy-four switches, eleven hubs, and nine access points are used. To ensuring this LAN, it needs parameters analyses such as cost, bandwidth with distance, reliability, better fault protector, and power consumption. Then design best LAN by considering all parameters and evaluate it with existence LAN. Reliability or failure-free operations of the system evaluate by sample of five times per month each downtime interval is for six hour at one-year time, in power consumption there is difference between LED and LASER optical light source, bandwidth based on JIT demand from ISP and internal communication, cost evaluate from online price. For customer, data prediction is depending on user categories such as light, medium and heavy users. According to these considerations, I proposed new better topology design and evaluate the performance relative to existing LAN. The proposed scheme is better due to cost difference between single mode and multimode fiber; LED has less power consumption than LASER, length of optical fiber affect reliability, needed bandwidth achieve at both topology and fiber modes. Therefore, there are two mechanisms used to mitigate it, using multimode as much as possible and change topology from extended star to ring-star.