Abstract: Disclosed herein is a shared Local Area Network (LAN) emulation method and apparatus. The method includes the following four steps. At the first step, a Logical Link Identifier (LLID) management table is set up to assign unique LLIDs to a plurality of Optical Network Units (ONUs) and manage the assigned LLIDs so as to identify the plurality of ONUs connected to a single Optical Line Terminal (OLT). Thereafter, a MAC address table is set up for the LLIDs to learn MAC addresses of the ONUs. Thereafter, the unique LLIDs are assigned to ONUs when the ONUs request registration from the OLT. Finally, data frames, which are received by a Shared LAN Emulation (SLE) layer of the OLT, are bridged using the LLIDs, VIDs of Virtual LANs to which the ONUs belong and destination MAC addresses of the data frames so as to provide a single matched port between a Logical Link Control (LLC) layer and a MAC layer of the OLT.

Abstract: A bandwidth allocation device and a dynamic bandwidth allocation method are provided for differentiated classes of service in an Ethernet Passive Optical Network (EPON), which includes an optical line termination (OLT), an optical distribution network (ODN), and a plurality of optical network units (ONUs). The OLT includes a Multi-Point Control Protocol (MPCP) allocator, which includes a class-based queue state counter and a grant generator. The ONU includes an MPCP requester, which includes a class-based buffer counter and a request generator. The device and the method enable efficient utilization of network resources using class-based grant allocation.

Abstract: Disclosed is a bandwidth allocation device and a dynamic bandwidth allocation method wherein an Ethernet frame is used for upstream/downstream transmission between an OLT and ONUs, the amount of bandwidth requested by the ONUs is reserved in advance based on class of service using an upstream frame, and, as a grant operation in response to these requests, a bandwidth allocation is dynamically performed to guarantee the QoS of each service. The OLT includes an MPCP allocator, and the ONU includes an MPCP requester. The MPCP allocator includes a class-based queue state counter and a grant generator. Upon receipt of a REPORT from a MAC control layer, this counter differentiates the ONU and obtains class-based queue length information of the ONU. When queue state information of all ONUs is obtained through the counter, the grant generator generates a service-based bandwidth for each ONU, and transmits a GATE. The MPCP requester includes a class-based buffer counter and a request generator.