A Fault-tolerant Mechanism on Star-ring Based Ethernet Passive Optical Networks
Ethernet Passive Optical Networks(EPONs)are proposed to overcome the bandwidth bottleneck at access networks due to its simplicity,cost effectiveness and wide spread deployment.The traditional PON architecture is bounded by the nature of tree topology,where data must be transmitted from node to central node before it could be redirected to another node which causes performance waste.To resolve this issue,a Sub-OLT component is assigned on the proposed star-ring based EPON architecture to control the partial traffic in the ring.All ONUs AF and BE traffics will be sent to Sub-OLT then transport to the OLT.On the other hand,all ONUs EF traffic(including Sub-OLT traffic)is transmitted directly at the assigned DBA time.In addition,to achieve high reliability and low-cost for deployment,a significant fault-tolerant mechanism on star-ring based EPON architecture is proposed in this article to provide protection against link fiber failure and ring fiber failure.This paper also proposes a Star-Ring Dynamic Bandwidth Allocation(SR-DBA)scheme on star-ring based EPON to handle dynamic bandwidth allocation process by OLT and Sub-OLT respectively.The simulation results show that the fault-tolerant SR-DBA can provide high system performance for different failure situations in terms of packet delay and expedited forwarding(EF)jitter,especially in high traffic loads.
Z.D.Shyu I.S.Hwang I.C.Lin
Department of General Education,Army Academy,Taoyuan City,Taiwan Department of Information Communication,Yuan-Ze University,Taoyuan City,Taiwan Department of Computer Science and Engineering,Yuan-Ze University,Taoyuan City,Taiwan
国际会议
Progress in Electromagnetics Research Symposium 2013(2013年电磁学研究新进展学术研讨会)
台北
英文
532-536
2013-03-01（万方平台首次上网日期，不代表论文的发表时间）