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Distributed EPON Architecture.
Source publication
Ethernet Passive Optical Network (EPON), an access network technology, has drawn considerable research attention in recent years. EPON can be implemented in centralized or decentralized architecture in the access network. Most of the researches were focused on the centralized architecture, where bandwidth allocation decisions for Optical Network Un...
Contexts in source publication
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... rest of the paper is organized as follows: Section 2 provides an overview of the distributed EPON architecture, proposed DBA and simulation result analysis. Section 3 presents the physical layer feasibility experiment and results. Finally some concluding remarks are presented. Fig. 1 shows the general architecture [6] of this approach. As can be seen from Fig. 1, a portion of the optical signal power transmitted by an ONU upstream transmitter toward the OLT will be redirected back and broadcasted to all ONUs; this broadcast is the foundation of inter-ONU connectivity. It will be used to exchange ONU control ...
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... paper is organized as follows: Section 2 provides an overview of the distributed EPON architecture, proposed DBA and simulation result analysis. Section 3 presents the physical layer feasibility experiment and results. Finally some concluding remarks are presented. Fig. 1 shows the general architecture [6] of this approach. As can be seen from Fig. 1, a portion of the optical signal power transmitted by an ONU upstream transmitter toward the OLT will be redirected back and broadcasted to all ONUs; this broadcast is the foundation of inter-ONU connectivity. It will be used to exchange ONU control information to initiate DBA calculation at ONUs (decentralized DBA). This can be ...
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... will be used to exchange ONU control information to initiate DBA calculation at ONUs (decentralized DBA). This can be achieved by connecting two ports of a 3xN SC with each other through an optical isolator as shown in Fig.1. Note that in addition to the conventional transceiver maintained at each ONU (a λ up transmitter and a λ d receiver), this approach requires an extra receiver tuned at λ up . ...
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Citations
Many issues of intra- optical network unit (ONU) bandwidth allocation in Ethernet Passive Optical Network (EPON) remain open. In this paper, we report the performance of hierarchical bandwidth allocation algorithm incorporated Russian Doll Model (RDM) as a solution to allocate bandwidth for intra- ONU in upstream EPON. The allocation of bandwidth is based on the class of service and its priority. Results confirm significant performance improvements for a wide range of traffic loads and triple-play (video, voice, and data) services in terms of the bandwidth utilization, wasted bandwidth and fairness compared with the SHDBA algorithm. The RDDBA maximum significant performance improvements compared to SHDBA is up to 30% depending on the variant and the characteristics of the network traffic. The hierarchical bandwidth allocation with RDM improves the performance of EPON by satisfying the requests of all ONUs and provide differentiated services by guaranteeing both the priority and fairness.
