Fiber based access networks can deliver performance that can support the in-

creasing demands for high speed connections. One of the new technologies that

has emerged in recent years is Ethernet Passive Optical Networks. The key fea-

tures of this approach are the simplicity of the architecture and compatibility

with existing Ethernet based local area networks.-Fiber based access networks can deliver performance that can support the in-

creasing demands for high speed connections. One of the new technologies that

has emerged in recent years is Ethernet Passive Optical Networks. The key fea-

tures of this approach are the simplicity of the architecture and　compatibility

with existing Ethernet based local area networks.