  Ethernet Passive Optical Networks (EPON) access systems are considered as an
alternative to ADSL for high speed access to the Internet. Supported by the
Ethernet First Mile Alliance and the IEEE, the MPCP protocol has been adopted
as the standardized MAC protocol for EPONs. Moreover, the IPACT dynamic
bandwidth allocation mechanism has been proposed for hierarchical multiplexing.
Today, IPACT is considered as interesting complement to MPCP for dynamic
bandwidth allocation over EPONs. In this paper, we propose an original
analytical model of the MPCP+IPACT protocol. Numerical results obtained from
this model are commented and compared to computer simulations.
