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EPON is an IEEE standard, EPON uses a point-to-multipoint structure, and passive optical transmission provides multiple services over Ethernet. Currently, IP/Ethernet applications account for more than 95% of the entire LAN communication. EPON uses the above-mentioned economical and efficient structure, and thus becomes the most effective communication method for connecting the end users of the access network. The emergence of 10Gbps Ethernet trunks and metropolitan area rings will also make EPON the best last-mile solution in future all-optical networks.
In an EPON, without any complex protocols, optical signals can be accurately transmitted to end users, and data from end users can also be centrally transmitted to the central network. At the physical layer, EPON uses the 1000BASE Ethernet PHY, and controls and optimizes burst data between ONUs and OLTs through newly added MAC control commands on the PON transmission mechanism. Communication and real-time TDM communication, in the second layer of the agreement, EPON adopts mature full-duplex Ethernet technology, uses TDM, because ONU sends datagram in one's own time slot, so there is no collision, do not need CDMA/CD, thus Make full use of bandwidth. In addition, EPON provides QoS similar to APON/GPON by implementing 802.1p in the MAC layer.