Abstract
Feature
Issue on Optical Ethernet (OE)
Ethernet passive optical network
(EPON) efficiency issues in both upstream and downstream directions are discussed in
detail, describing each component of the overall transmission overhead as well as
quantifying their effect on the system's performance and comparing them with the other
existing passive optical network (PON) access systems, namely, asynchronous transfer
mode PON (APON) and generic framing PON (GPON). For EPON, two main transmission overhead
groups are defined, namely, Ethernet encapsulation overhead and EPON-specific scheduling
overhead. Simulations are performed using the source aggregation algorithm (SAA) to
verify the Ethernet encapsulation overhead for various synthetic and measured packet
size distributions (PSDs). A SAA based an EPON simulator is used to verify both upstream
and downstream overall channel efficiencies. The obtained simulation results closely
match the theoretical limits estimated based on the IEEE 802.3ah standard. An estimated
throughput of 820 to 900 Mbits/s is available in the upstream direction, whereas in the
downstream direction effective throughput ranges from 915 to 935 Mbits/s.
© 2006 Optical Society of America
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