Abstract: An information processing device includes a buffer that stores data blocks of a plurality of flows and from which the data blocks are sequentially read; a processor coupled to the buffer and configured to: monitor an input rate that is a sum of data amounts of the plurality of flows input to the buffer per unit of time, and suppress flowing of a data block into the buffer for one or more of the plurality of flows based on a result of monitoring the input rate.

Abstract: An apparatus for controlling buffering of an arrival packet. The apparatus includes a packet buffer for temporarily storing each of one or more packets to be transmitted in association with an arrival time thereof, and a packet discard section for determining an arrival packet to be discarded or to be stored in the packet buffer, based on a discard condition defined by using a packet residence time that is calculated on the basis of one or more residence times of one or more packets staying in the packet buffer, wherein the arrival packet is defined as a packet that has newly arrived at the apparatus.

Abstract: A repeater stores retrieval situation of an address retrieved as an address identical with the transmission destination address of the reception frame in association with each address registered in the learning table, refers to, when the transmission source address of the received frame is registered in the learning table, the retrieval situation of the address stored in association with a port identical with the port that receives the frame from among retrieval situations, specifies an address to be overwritten by the transmission source address of the reception frame, overwrites and registers the transmission source address of the reception frame on the specified address, and updates, when the address identical with the transmission destination address of the received frame is retrieved from the learning table, the retrieval situation stored in association with the retrieved address.

Abstract: A transmission apparatus for receiving frames from one transmission path, storing the frames in plural buffers, and transmitting the frames to another transmission path in which an estimated discard time determination part configured to determine an estimated discard time of the frames stored in the plural buffers, a transmission order determination part configured to determine a transmission order of the frames, an estimated transmission time calculation part configured to calculate an estimated transmission time of each of the frames based on the transmission order, and a discard control part configured to discard a target frame from the frames stored in the plural buffers based on the estimated transmission time and the estimated discard time in a case where the estimated discard time of the target frame is the same as or earlier than the estimated transmission time of the target frame, are provided.

Abstract: A communication device capable of restraining the packet transmission efficiency from lowering. An address storing unit extracts, from uplink packets, the addresses of terminals connected to sub-units and registers the addresses in an address management table. An address extracting unit extracts the address of a destination terminal included in a downlink packet output from a layer 2 switch, and an address determining unit determines whether or not the address of the destination terminal is registered in the address management table. In accordance with the result of the determination, a packet output unit outputs the downlink packet to a corresponding coupler.

Abstract: A repeater stores retrieval situation of an address retrieved as an address identical with the transmission destination address of the reception frame in association with each address registered in the learning table, refers to, when the transmission source address of the received frame is registered in the learning table, the retrieval situation of the address stored in association with a port identical with the port that receives the frame from among retrieval situations, specifies an address to be overwritten by the transmission source address of the reception frame, overwrites and registers the transmission source address of the reception frame on the specified address, and updates, when the address identical with the transmission destination address of the received frame is retrieved from the learning table, the retrieval situation stored in association with the retrieved address.

Abstract: An apparatus for controlling buffering of an arrival packet. The apparatus includes a packet buffer for temporarily storing each of one or more packets to be transmitted in association with an arrival time thereof, and a packet discard section for determining an arrival packet to be discarded or to be stored in the packet buffer, based on a discard condition defined by using a packet residence time that is calculated on the basis of one or more residence times of one or more packets staying in the packet buffer, wherein the arrival packet is defined as a packet that has newly arrived at the apparatus.

Abstract: A packet transmission device including plural queues for storing packets to be transmitted is provided. The device includes a token storage section for storing queue information for identifying a queue and an accumulated token value in which token values assigned to the queue are accumulated so as to obtain correspondence therebetween and a capture section for identifying one or both of an unused queue and a queue in which the accumulated token value exceeds a given upper limit value and capturing the queue information thereof. The device includes a selection section for selecting the queue information of the unidentified queue on the basis of the queue information captured using the capture section and an addition section for adding the accumulated token value of the token storage section on the basis of the queue information selected using the selection section.

Abstract: A relay device includes response frame transmitting technique for transmitting a response frame with the result of the inquiry to the effect that the source address coincident with the destination address to be inquired has been registered in the learning table to the relay device from which the inquiry frame was transmitted in the case that the registration judging technique has judged that the source address coincident with the destination address to be inquired has been registered in the learning table, and frame relaying technique for relaying the received frame whose relay has been temporarily postponed via the receiving port for the response frame in the case that the response frame was received.

Abstract: In a communication system comprising a network unit and a plurality of subscriber units connected to the network unit, the network unit generates a message in which validity of transmission grant information is set for the subscriber units, and suspends a transmission of polling information to allocate a transmission grant to the subscriber units by using the transmission grant information for a fixed time in consideration of a processing time of the subscriber units from a time when the message has been completely transmitted. Also, when a disconnection state of an inputted cell from the subscriber units is detected, the network unit may suspend an input disconnection detecting operation for a fixed time from a time when the message and the polling information have been completely transmitted. Furthermore, a switchover of an input disconnection detection/transmission grant information may be suspended by mutually exchanging messages.

Abstract: A method of controlling the communication rate between a user terminal and an edge switch of a network is provided. This method includes the step of matching the transmission rate at which data is transmitted from the user terminal to the edge switch, with the communication rate of the edge switch that is determined under contract with a user.

Abstract: A communication system is provided for preventing delivery of unnecessary packets to a user terminal and thereby improving transmission efficiency. In the communication system, an OLT communication interface transfers packets between a local office and a subscriber or transmits filter-setting data and receives filter-state data. An ONU communication interface transfers packets between the local office and the subscriber or receives the filter-setting data and transmitting the filter-state data. A terminal address managing unit obtains and manages a terminal address from a connected terminal. A packet filter performs an operation of filtering packets transmitted from an optical line terminal with respect to the connected terminal on the basis of at least one of delivery information, registered information and the filter-setting data.

Abstract: A communication device capable of restraining the packet transmission efficiency from lowering. An address storing unit extracts, from uplink packets, the addresses of terminals connected to sub-units and registers the addresses in an address management table. An address extracting unit extracts the address of a destination terminal included in a downlink packet output from a layer 2 switch, and an address determining unit determines whether or not the address of the destination terminal is registered in the address management table. In accordance with the result of the determination, a packet output unit outputs the downlink packet to a corresponding coupler.

Abstract: An optical access system that sends packets in a given time slot more efficiently without wasting bandwidth. The uplink channel from slave devices to a master device is divided into time slots. The sending slave device reads out upstream packets from its send packet buffer when an assigned time slot comes. If the maximum frame size is reached in the middle of a packet, the slave device suspends further reading until a next assigned time slot comes. The packets are sent to the master device, each being set off by a start and end delimiters. Detection of a start delimiter causes the master device to begin writing each received data word into a receive packet buffer, which is terminated by the end delimiter of that packet. Received packets are retrieved from their memory locations specified by a read address that includes the sender's slave device number.

Abstract: In a system where a plurality of terminal units are connected to a network unit via an optical transmission line and packets are transmitted in units of cells according to polling information, polling request information including the number of variable-length packets stored in the buffer of each of the terminal unit, the number of cells composing each variable-length packet and the number of remaining cells of a packet being read is created, polling information corresponding to a time slot allocated according to the polling request information is transmitted from the shared band control unit of the network unit, and bands are allocated to the plurality of terminal units.

Abstract: In a communication system comprising a network unit and a plurality of subscriber units connected to the network unit, the network unit generates a message in which validity of transmission grant information is set for the subscriber units, and suspends a transmission of polling information to allocate a transmission grant to the subscriber units by using the transmission grant information for a fixed time in consideration of a processing time of the subscriber units from a time when the message has been completely transmitted. Also, when a disconnection state of an inputted cell from the subscriber units is detected, the network unit may suspend an input disconnection detecting operation for a fixed time from a time when the message and the polling information have been completely transmitted. Furthermore, a switchover of an input disconnection detection/transmission grant information may be suspended by mutually exchanging messages.