Abstract

An uplink access scheme for the Ethernet passive optical network (EPON), called broadcast polling (BP), has been proposed. In the BP scheme, the optical line terminal (OLT) knows all optical network units' (ONUs) bandwidth requirements before allocating bandwidth to them, and only one gate message is used to inform all ONUs of their bandwidth grant information in every cycle. Compared with interleaved polling with adaptive cycle time (IPACT)--an important access scheme--BP can adopt more- sophisticated bandwidth-allocation algorithms so that it can better support the service-level agreement (SLA). Based on packet-delay analysis for the BP scheme, a simple bandwidth-allocation algorithm aiming to provide three different service levels to customers has been designed. The simulation results show that the algorithm works well. In fact, more-sophisticated algorithms can be designed on the basis of the BP scheme to support more-sophisticated SLAs.

© 2004 Optical Society of America

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