Method for managing service bandwidth by customer port and EPON system using the same

An optical line terminal (OLT) of an Ethernet based optical passive network (EPON) system, comprising:

• a customer information lookup table for storing customer identifiers allocated by a media access control (MAC) address that is addresses of physical mediums connected to an optical network unit (ONU);
• a customer identification tag tagging unit for finding a corresponding customer identifier from the customer information lookup table using a destination MAC address of a downlink data packet to be transmitted to an optical network unit (ONU) and inserting the found customer identifier into the downlink data packet as a customer identification tag;
• a service classification unit for finding a service identifier of the downlink data packet among service identifiers allocated by a service type by classifying a service type of the downlink data packet;
• a service identification tag tagging unit for inserting the service identifier provided from the service classification unit into the downlink data packet as a service identification tag;
• a bandwidth control unit for identifying a service class according to a combination of the customer identifier and the service identifier included in the downlink data packet, and controlling a service bandwidth according to the identified service class;
• a customer information extracting unit for extracting a source MAC address and a customer identifier from an uplink data packet received through the link control unit, and updating the customer information lookup table using the extracted MAC address and customer identifier;
• and
• a link control unit for transmitting the downlink data packet to an optical line terminal (OLT) in response to the control of the bandwidth control unit by supporting an Ethernet based packet transmission with the customer terminal.

An Ethernet based passive optical network (EPON) system comprising:

• more than one of optical network units (ONU) for allocating a service class according to a combination of information about a customer that receives a service, and a service type and a service priority of a service provided to a customer, allocating a bandwidth according to each service class and controlling a uplink bandwidth according to a service class;
• an optical line terminal for allocating a service class according to a combination of information about a customer that receives a service, and a service type and a service priority of a service provided to a customer, allocating a bandwidth according to each service class and controlling a downlink bandwidth according to a service class;
• and
• a system manager for collecting information about a service provider, a service provided from a service provider, a customer that receives a service, and information for classifying a service, and providing the collected information to the ONU and the OLT;
• wherein the ONU and the ONT set an allowable bandwidth by a service class and control data packet transmission to be sustained within the allowable bandwidth.