ONU REQUEST TRANSMISSION METHOD IN ETHERNET-PHONE STRUCTURE

摘要

PURPOSE: An ONU(Optical Network Unit) request transmission method in an Ethernet-phone structure is provided to be continuously informed on status of an ONU from an uplink data frame by adding uplink request information of the ONU to the preamble of an Ethernet frame. CONSTITUTION: A MAC layer(21) has a MAC control function of IEEE802.3 and additionally includes an MPCP(Multi-Protocol Control Protocol), a transmission control function of an E-PON(Ethernet-Passive Optical Network). An RS(Reconciliation Sublayer)(23) performs a P2PE(Point-to-Point Emulation) function and an OAM(Operation and Management) function for allowing ONUs belonging to an OLT(Optical Line Terminal) domain to communication with each other, and an information insertion/extraction function of the ONU. The ONU performs a frame filtering function using a physical ID and a MAC preamble recovery function. The physical ID is assigned by an Ethernet PON OLT. An RS(26) compares a physical ID of a preamble of a frame received from an OLT and its own physical ID, and sends it to an upper layer(25) or discards it according to a mode of the received frame. When the ONU receives grant for transmission from the OLT, it indicates its request information in a preamble of a subscriber Ethernet frame to be transmitted to the OLT and transmits it. the OLT collects request information of each ONU from the preambles of Ethernet frames and transmits it to a MAC control layer(24).