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描述了在以太网无源光网络(EPON)系统中光线路终端(OLT)到多个光网络单元(ONU)的下行数据和ONU到OLT上行数据如何实现变长数据包的发送。与异步传输模式无源光网络(ATM—PON)相比,变长数据包减少了传输时的开销。另外,利用时分复用的上行数据不存在共享介质网络中带冲突检测的载波侦听多路存取技术(CSMA/CD)的距离限制。同时也研究了如何提高时隙的利用率问题。 相似文献
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Anusha Sivakumar Ganesh C. Sankaran Krishna M. Sivalingam 《Optical Switching and Networking》2013,10(4):465-474
Long Reach PONs (LR-PON) were proposed to extend the benefits of Passive Optical Networks (PON) to more users and to a larger area. This paper considers a Dynamic Bandwidth Allocation (DBA) based on a hybrid combination of Time Division Multiplexing (TDM) and Wavelength Division Multiplexing (WDM). The time complexity of the DBA algorithm is typically O(n log n), where n denotes the number of ONUs. Since the maximum number of supported ONUs in an LR-PON can be as high as 2048, the computation time required for computing a schedule will be very high and directly impacts the overall network performance. In this paper, we have presented a grouping strategy to reduce the computation requirements. The number of ONUs is split into mutually exclusive groups with the OLT scheduling each group independently and in parallel. With the static grouping strategy every user is assigned to a group and the assignment of wavelength resources is fixed. However, with non-uniform loads, we observed that static grouping was not found to be suitable as the delay variation was significant across the groups. To address this gap, we introduce the concept of dynamic grouping and define three dynamic grouping heuristics that adapt to the current network load conditions and (re)allocate the ONUs and wavelength resources suitably. The proposed schemes have been compared in terms of delay variation and wavelength utilization. Of the three heuristics, ONU to Least Loaded wavelength group (OLL) and Least Wavelength Resources (LWR) heuristics balance the packet delay across ONUs assigned to different groups and Proportional Wavelength Usage (PWU) heuristic reduces power consumption by allocating fewer wavelength resources. 相似文献
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介绍漳州广电网络在双向改造过程中采用的EPON+EOC的新型接入技术,根据漳州电视用户的具体情况说明EPON系统的设计思路,并对EPON建设过程中的系统配置和典型故障案例进行分析。 相似文献
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阐述EPON技术的特点与优势,对EPON技术在网络应用中的关键技术进行分析,结合黑龙江垦区专用通信网的业务需求,采用EPON技术在各类FTTx场景中进行应用推演,提高网络传输带宽,优化网络结构,降低建设成本,为黑龙江垦区专用通信网接入层面的发展提出了较为全面EPON解决方案,提供了一个可参考的建设模式。 相似文献
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基于光功率检测和功率叠加原理,以及当前的xPON部署应用情况,提出了一种实用性、可靠性强的长发光ONU快速检测、定位和隔离的解决方案.经过规模应用的验证,该方案可行有效. 相似文献