Dynamic bandwidth allocation method considering multiple servics for ethernet passive optical network

PURPOSE: A method for dynamically allocating bandwidths in consideration of a multi-service in an EPON(Ethernet Passive Optical Network) is provided to improve system scalability and efficiency in an EPON and to efficiently offer services of various characteristics to subscribers. CONSTITUTION: An OLT(Optical Line Terminal)(50) executes dynamic bandwidth allocation for data transmission to ONUs(Optical Network Units)(60-1-60-N). Each of the ONUs(60-1-60-N) has a plurality of queues according to service classes. Each ONU comprises a scheduler(70) to store the data traffics received to queues(80,82,84) and to ensure QoS(Quality of Service) by executing dynamic bandwidth allocation in consideration of each service class for the queues(80,82,84).