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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