IEEE Passive Optical Networks

This chapter begins with a discussion on the Ethernet point‐to‐multi‐point (EPON) protocol. The EPON standard, which was developed as part of the IEEE Ethernet in the First Mile (EFM) project, was motivated by a desire to leverage the traditional advantages of Ethernet. EPON supports autodiscovery of ONUs and FEC. EPON allows the optional use of FEC. The chapter describes the 10G EPON protocol primarily in terms of how it differs from EPON. 10G EPON shares much of its protocol with EPON. A combination of coarse wave division multiplexing (CWDM) and time division multiplexing (TDM) is used in order to allow EPON and 10G EPON systems to co‐exist on the same PON. Service‐specific functions are optional on either an OLT or ONU. Some of the major technical features of Service Interoperability in Ethernet Passive Optical Networks (SIEPON) include: management, QoS guarantees, power saving, data encryption, and ONU authentication.