Patent ID: 7733780

Claim:
An optical network unit (ONU) of an Ethernet based passive optical network (EPON) system, comprising: a customer identification tag tagging unit for finding a customer identifier for an uplink data packet to be transmitted to an optical line terminal (OLT) among customer identifiers allocated by a customer, and inserting the found customer identifier as a customer identification tag; a service classification unit for finding a service identifier of the uplink data packet among service identifiers allocated by a service type by classifying a service type and feature of the uplink data packet; a service identification tag tagging unit for inserting the found service identifier from the service classification unit into the uplink data packet as a service identification tag; a bandwidth control unit for identifying a service class according to the customer identifier and the service identifier of the uplink data packet, and controlling a service bandwidth according to the identified service class; and a link control unit for transmitting the uplink data packet to an optical line terminal (OLT) in response to the control of the bandwidth control unit; wherein the customer identification tag tagging unit includes a mapping table composed of a customer access port field and a customer identifier field, and finds a customer identifier corresponding to a customer access port where a corresponding uplink data packet is input.