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In this paper, the authors examine the downstream impediments of centralized Ethernet passive optical networks supporting LAN emulation [inter-Optical Network Units communication (ONU)]. The available downstream bandwidth in the centralized scheme is reduced due to LAN emulation and upstream bandwidth allocation functions. The reduction in available downstream bandwidth results in degraded downstream performance. To address this problem, they implement a LAN capable distributed ring architecture, where Optical Line Terminal is relieved from the burden of upstream bandwidth allocation and inter-ONU communication.
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