Abstract:
PURPOSE: An OLT(Optical Line Terminal) in a GPON(Gigabit Passive Optical Network) and a method for transmitting a broadcast frame using the same are provided to retransmit a broadcast frame downstream without having to manage an Ethernet address and an IP address. CONSTITUTION: A PON(Passive Optical Network) connects an OLT(Optical Line Terminal)(10) installed in a telephone office to ONUs(Optical Network Units)(20), also called ONTs(Optical Network Terminals), installed in a home through a passive optical splitter in a point to multi-point scheme. A downstream transmission from the OLT to the optical network unit is performed through a broadcast transmission scheme allowing all packets to be transmitted to the optical network unit. However, an upstream transmission from the optical network units to the optical line terminal is performed by sharing a single optical link with a plurality of optical network units based on various medium access control schemes. A broadcast frame, such as an ARB packet, needs to be output through ports except for a port of an Ethernet switch which has transmitted the broadcast frame. When transmitting a broadcast frame in the GPON(Gigabit Passive Optical Network), two transmission paths are considered based on the direction of a transmission.
Abstract:
PURPOSE: An ONT(Optical Network Terminal), an OLT(Optical Line Terminal) and GPON(Gigabit Passive Optical Network) comprising these are provided to apply variably generated delay time generated with the variable in bit unit by data bus size by UL/DL transmission rate and by clock frequency to distance measurement thereby exactly measuring distance of ONTs in bit unit. CONSTITUTION: A DL(DownLink) frame demultiplexer(413) extracts a distance measurement request message by inverse multiplexing of a downward frame. An UL(UpLink) transmission controller(414) controls transmission time of an UL frame by calculation of time for start bit search time of the downward frame and UL/DL clock deviation. An UL frame multiplexer](415) performs delayed output of upward frame as time of calculated byte unit. A bit unit delay unit(416) performs delay output of the upward frame as time of calculated residual bit unit.
Abstract:
An apparatus and a method efficient dynamic bandwidth allocation for a TDMA based passive optical network are provided to reduce a delay problem by allocating remaining uplink bandwidths to all ONUs(Optical network Units) evenly. A class queue information storage(100) stores a band allocation period for each T-CONT type as well as band amount information. An allocation check table unit(200) checks the received band allocation period received from the class queue information storage. The amount of a band which can be allocated is determined according to the checked period for band allocation. A band allocator(300) re-allocates the remaining uplink bandwidth for each T-CONT type.
Abstract:
1. 청구범위에 기재된 발명이 속하는 기술분야 본 발명은 광대역 종합 정보 통신망의 셀-기반 물리계층의 분산 표본 혼화 장치를 16비트 모드의 유토피아 인터페이스에서 사용하기 위한 병렬 처리기에 관한 것임. 2. 발명이 해결하고자하는 기술적 요지 본 발명은 소정 비트의 의사 랜덤 바이너리 비트열 신호를 병렬 처리하여, 광대역 종합 정보 통신망의 셀 경계 식별을 용이하게 할 수 있는 분산 표본 혼화 장치의 병렬 처리기를 제공함에 그 목적이 있다. 3. 발명의 해결 방법의 요지 소정 바이트의 비동기 전송 모드셀에 따라 소정 비트의 제 1 및 제 2 의사 랜덤 바이너리 비트열을 출력하는 제 1 및 제 2 의사 랜덤 비트열 발생수단; 선택신호에 따라 상기 소정 비트의 제 1 및 제 2 의사 랜덤 바이너리 비트열을 선택적으로 출력하는 선택수단; 및 상기 선택수단으로부터 출력된 신호들을 일지 저장한 후 출력하는 저장수단을 포함한다. 4. 발명의 중요한 용도 본 발명은 의사 랜덤 바이너리 비트열을 소정 비트 단위로 병렬 처리하는데 이용됨.